Smart smoke detectors add phone alerts and connected-home features to the basic job of warning people inside your home. My best overall pick is the First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm for buyers who want smoke and CO coverage in a hardwired setup. The Kidde Smart Smoke and CO Detector with Ring, AA Battery Powered suits Ring households, while the HEIMAN Matter over Thread Smart Smoke Detector is a distinct option for homes built around Matter-compatible devices. The main tradeoffs are hardwired versus battery power, smoke-only versus combination alarms, and app or hub compatibility. Read on for the full breakdown of all 14 options and how to choose the right setup for your home.
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Key Takeaways
- Combination coverage leads this lineup: Many picks detect both smoke and carbon monoxide, while several are smoke-only; match the alarm type to the hazards and existing alarms in each location.
- Wiring shapes the shortlist: Hardwired models from First Alert and Kidde can suit homes with existing alarm wiring, while battery-powered choices avoid depending on an electrical connection.
- Connectivity is not interchangeable: Ring-focused Kidde models, Matter over Thread HEIMAN options, and X-Sense systems each suit different smart-home setups and should be checked against the buyer’s existing ecosystem.
- Interconnection and alerts solve different problems: Linked alarms can alert occupants across a home, while phone notifications can help people who are away; a feature list should not blur the two.
- Pack size affects planning: The X-Sense SC07 5-pack and SC07-W 6-pack can simplify multi-room coverage, but buyers should confirm detector type, interconnection method, and placement needs before choosing a bundle.
| X-Sense XP0H-WN Wireless Smoke and Carbon Monoxide Detector, 3-Pack |  | Best for Simple Whole-Home Coverage | Model: XP0H-WN | Quantity: 3 alarms | Detection: Smoke and carbon monoxide | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke and CO Detector with Ring, AA Battery Powered, RGCUDR-RW |  | Best for Ring Households | Model: RGCUDR-RW | Detection: Smoke and carbon monoxide | Power: Two included AA alkaline batteries | VIEW LATEST PRICE | See Our Full Breakdown |
| HEIMAN S1-TM Matter over Thread Smoke Detector with Temperature and Humidity Sensors |  | Best for Matter Smart Homes | Model: S1-TM | Detection: Smoke | Sensor: Photoelectric | VIEW LATEST PRICE | See Our Full Breakdown |
| X-Sense Interconnected Smoke and Carbon Monoxide Detector Kit with Remote |  | Best for Remote Whole-Home Control | Included alarms: Four XP0H-WN smoke and CO detectors | Included remote: One RC01 Pro | Sensors: Photoelectric smoke and electrochemical CO | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Hardwired Smart Smoke and Carbon Monoxide Detector with App Alerts and Battery Backup |  | Best Hardwired Smart Pick | Model: 30CUAR-W | Detection: Smoke and carbon monoxide | Power: 120V AC hardwired | VIEW LATEST PRICE | See Our Full Breakdown |
| HEIMAN Matter over Thread Smart Smoke Detector |  | Best for Matter and Thread Homes | Model: S1-M | Connectivity: Matter over Thread | Sensor: Dual-beam photoelectric | VIEW LATEST PRICE | See Our Full Breakdown |
| First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm |  | Best Hardwired Smoke and CO Upgrade | Model number: SMCO600NV-AC | Alarm type: Smoke and carbon monoxide combination alarm | Primary power: Corded electric | VIEW LATEST PRICE | See Our Full Breakdown |
| First Alert SC5 Battery Smart Smoke and Carbon Monoxide Alarm |  | Best Battery-Powered Smart Combination Alarm | Model number: SMCO600NV | Alarm type: Smoke and carbon monoxide combination alarm | Power: Battery powered | VIEW LATEST PRICE | See Our Full Breakdown |
| X-Sense SC07 Smoke and Carbon Monoxide Detector, 5-Pack |  | Best Multi-Room Standalone Set | Model: SC07 | Pack quantity: 5 detectors | Alarm type: Smoke and carbon monoxide | VIEW LATEST PRICE | See Our Full Breakdown |
| HEIMAN Smart Carbon Monoxide Detectors, 3-Pack with Gateway |  | Best Connected CO Coverage for Multiple Rooms | Model: C1-R | Included: 3 CO alarms and 1 gateway | Connectivity: 2.4 GHz Wi-Fi | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke and CO Detector with Ring, Hardwired with AA Battery Backup |  | Best for Ring-Connected Hardwired Homes | Detection: Smoke and carbon monoxide | Power: Hardwired with AA battery backup | Connectivity: Ring app and Alexa-enabled devices | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke Detector with Ring, AA Battery, RGSDR-RW |  | Best for Wire-Free Ring Alerts | Power: Two AA alkaline batteries, included | Connectivity: Ring app | Interconnection: Wire-free interconnection with compatible Kidde alarms | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Hardwired App-Enabled Smart Smoke Detector with AA Battery Backup |  | Best for Kidde App Users | Model: 20SAR-W | Power: 120V AC | Backup batteries: Two AA batteries, included | VIEW LATEST PRICE | See Our Full Breakdown |
| X-Sense SC07-W Interconnected Smoke and Carbon Monoxide Detectors, 6-Pack |  | Best for Whole-Home Coverage Without Wi-Fi | Quantity: Six alarms | Detection: Smoke and carbon monoxide | Power: Sealed lithium battery with 10-year life | VIEW LATEST PRICE | See Our Full Breakdown |
| smart smoke detector | Power | Connectivity | Model | Detection |
|---|---|---|---|---|
| X-Sense XP0H-WN Wireless Smoke | Sealed lithium battery | — | XP0H-WN | Smoke and carbon monoxide |
| Kidde Smart Smoke and CO Detec | Two included AA alkaline batteries | Ring app, wireless interconnectivity, and Alexa-enabled devices | RGCUDR-RW | Smoke and carbon monoxide |
| HEIMAN S1-TM Matter over Threa | — | Matter over Thread | S1-TM | Smoke |
| X-Sense Interconnected Smoke a | Sealed lithium metal battery | — | — | — |
| Kidde Hardwired Smart Smoke an | 120V AC hardwired | 2.4 GHz Wi-Fi and Kidde app | 30CUAR-W | Smoke and carbon monoxide |
| HEIMAN Matter over Thread Smar | CR123A battery; included | Matter over Thread | S1-M | — |
| First Alert SC5 Hardwired Smar | — | First Alert app alerts; compatible with Google’s Nest Protect Alarm | — | — |
| First Alert SC5 Battery Smart | Battery powered | — | — | — |
| X-Sense SC07 Smoke and Carbon | — | — | SC07 | — |
| HEIMAN Smart Carbon Monoxide D | Battery operated; batteries included | 2.4 GHz Wi-Fi | C1-R | — |
| Kidde Smart Smoke and CO Detec | Hardwired with AA battery backup | Ring app and Alexa-enabled devices | — | Smoke and carbon monoxide |
| Kidde Smart Smoke Detector wit | Two AA alkaline batteries, included | Ring app | — | Smoke |
| Kidde Hardwired App-Enabled Sm | 120V AC | 2.4 GHz Wi-Fi and Kidde app | 20SAR-W | Smoke |
| X-Sense SC07-W Interconnected | Sealed lithium battery with 10-year life | — | — | Smoke and carbon monoxide |
More Details on Our Top Picks
X-Sense XP0H-WN Wireless Smoke and Carbon Monoxide Detector, 3-Pack
I’d choose this three-pack when coordinated alarms and long battery life matter more than app control. Each unit detects smoke and carbon monoxide, and wireless interconnection means the other alarms sound when one detects danger—a useful advantage over a standalone detector such as the Kidde Hardwired Smart Smoke and Carbon Monoxide Detector, which adds app alerts but is sold as one unit here. Sealed batteries rated for 10 years also remove routine battery changes, while the broad mounting bracket can cover old holes or ceiling marks.
The tradeoff is that this is not a connected smart-home alarm: there’s no Wi-Fi, base station, or remote phone notification, and installation is not hardwired. I’d pick it for straightforward linked protection, not for checking alerts while away.
Pros:- Each alarm detects both smoke and carbon monoxide
- Wireless interconnection makes all alarms sound when one detects a hazard
- Sealed battery is rated for 10 years
- Large mounting bracket can cover existing screw holes and ceiling marks
Cons:- No Wi-Fi, base station, or remote app notifications
- Battery-powered rather than hardwired
Best for: Homeowners who want three interconnected smoke-and-CO alarms with long-life batteries and no app setup
Not ideal for: Buyers who need phone alerts, smart-home integration, or hardwired installation
- Model:XP0H-WN
- Quantity:3 alarms
- Detection:Smoke and carbon monoxide
- Sensors:Photoelectric and electrochemical
- Power:Sealed lithium battery
- Battery life:10 years
- Interconnection:Wireless; all alarms sound together
- Mounting bracket diameter:5.7 in (145 mm)
- Standards:UL 217 and UL 2034
Our verdict“Choose this pack for linked, low-maintenance smoke-and-CO coverage if remote alerts are not a priority.”
Kidde Smart Smoke and CO Detector with Ring, AA Battery Powered, RGCUDR-RW
This Kidde is the clearest fit for buyers who want phone alerts without wiring and already use Ring. It reports smoke, carbon monoxide, and low battery through the Ring app without requiring a subscription for notifications. It also connects wirelessly with other Kidde alarms and can send alerts to Alexa-enabled devices, giving it more remote awareness than the X-Sense XP0H-WN, which links alarms locally but has no Wi-Fi or app access.
Its cooking-nuisance-reduction sensing is useful in kitchens or nearby hallways, though it does not remove the possibility of unwanted alarms. The main compromise is dependence on two AA batteries rather than a sealed 10-year battery. Optional 24/7 monitoring also carries a separate subscription, so buyers should distinguish that service from the included app notifications.
Pros:- Ring app notifications for smoke, carbon monoxide, and low battery do not require a subscription
- Detects both smoke and carbon monoxide
- Wireless interconnectivity works with other Kidde alarms
- Designed to reduce cooking-related nuisance alarms
Cons:- Requires two AA alkaline batteries rather than a sealed long-life battery
- Optional 24/7 monitoring requires a paid subscription
Best for: Ring users who want battery-powered smoke-and-CO detection with app alerts and wireless links to compatible Kidde alarms
Not ideal for: Buyers seeking a sealed long-life battery, hardwired power, or included professional monitoring
- Model:RGCUDR-RW
- Detection:Smoke and carbon monoxide
- Power:Two included AA alkaline batteries
- Connectivity:Ring app, wireless interconnectivity, and Alexa-enabled devices
- Notifications:Smoke, CO, and low-battery alerts
- Subscription:App notifications require no subscription; optional 24/7 monitoring is available
- Certifications:UL 217 and FCC standards
Our verdict“Pick this model if Ring app alerts are more useful to you than a sealed battery or built-in professional monitoring.”
HEIMAN S1-TM Matter over Thread Smoke Detector with Temperature and Humidity Sensors
For a buyer building around Matter, the HEIMAN S1-TM offers a different kind of smart functionality from app-dependent alarms: Matter over Thread integration can connect it with compatible platforms including Apple Home, Google Home, Alexa, SmartThings, Homey, and Home Assistant. Temperature and humidity readings add useful household context beyond smoke detection. Compared with the Kidde Ring battery detector, this model is broader in smart-home platform support but needs a compatible Matter hub with a Thread Border Router.
The photoelectric sensor is designed to reduce false alarms from cooking and steam, and the 85 dB alarm, test/silence control, and choice of magnetic or screw mounting cover practical basics. The tradeoff is setup complexity: network requirements may matter, particularly for Home Assistant users. It detects smoke only, unlike the X-Sense and Kidde combination alarms that also detect carbon monoxide.
Pros:- Matter over Thread supports several major smart-home platforms
- Temperature and humidity monitoring supplement smoke detection
- Photoelectric sensing is designed to reduce cooking- and steam-related false alarms
- Includes an 85 dB alarm, test/silence control, and magnetic or screw mounting
Cons:- Smart integrations require a compatible Matter hub with a Thread Border Router
- Does not detect carbon monoxide
- Home Assistant setup may require IPv6 and mDNS support on the local network
Best for: Smart-home users with a Matter hub and Thread Border Router who want smoke detection plus temperature and humidity readings
Not ideal for: Buyers who need carbon monoxide detection in the same alarm or want smart features without adding a compatible hub
- Model:S1-TM
- Detection:Smoke
- Sensor:Photoelectric
- Connectivity:Matter over Thread
- Smart-home compatibility:Apple Home, Google Home, Alexa, SmartThings, Homey, and Home Assistant
- Additional sensors:Temperature and humidity
- Alarm volume:85 dB
- Power and alarm life:Battery-powered; 10-year alarm life
- Mounting:Magnetic or screw mounting
Our verdict“Choose the S1-TM for a Matter-based home that values cross-platform integration and environmental readings, but pair smoke protection with separate CO detection.”
X-Sense Interconnected Smoke and Carbon Monoxide Detector Kit with Remote
This kit is the strongest choice here for buyers who want four linked smoke-and-CO alarms plus a shared remote. Its RC01 Pro can test or silence alarms remotely, while the display shows CO levels, battery level, and working status. That makes routine checks easier than with the X-Sense XP0H-WN three-pack, which has similar 10-year sealed-battery and interconnection fundamentals but no included remote or CO display.
All four alarms use photoelectric smoke and electrochemical CO sensors, and installation needs no rewiring. The tradeoff is that the kit remains non-Wi-Fi, so remote control means using the included remote nearby, not receiving phone alerts while away. Its sealed battery is not described as replaceable, making the stated battery life and replacement planning important parts of the decision.
Pros:- Includes four combination alarms and an RC01 Pro remote
- RF interconnection lets alarms sound together across the home
- Remote supports testing and silencing, while the display shows CO and status information
- Sealed 10-year battery and no-rewiring installation
Cons:- No Wi-Fi or phone notifications
- The sealed battery is not described as replaceable
Best for: Households seeking four interconnected smoke-and-CO alarms with remote testing, silencing, and visible CO readings
Not ideal for: Buyers who want app notifications, Wi-Fi integration, hardwired alarms, or a replaceable battery
- Included alarms:Four XP0H-WN smoke and CO detectors
- Included remote:One RC01 Pro
- Sensors:Photoelectric smoke and electrochemical CO
- Power:Sealed lithium metal battery
- Battery life:10 years
- Interconnection:RF interconnected
- Display:Real-time CO levels, battery level, and working status
- Installation:No rewiring; wall or ceiling mounting
- Safety standards:UL 217 and UL 2034; ETL listed
Our verdict“Choose this kit over the three-alarm XP0H-WN pack if you need broader coverage and remote controls, but not app-based alerts.”
Kidde Hardwired Smart Smoke and Carbon Monoxide Detector with App Alerts and Battery Backup
This Kidde makes the most sense when a home already has compatible wiring and the buyer wants app alerts backed by household power. It connects to the Kidde app over 2.4 GHz Wi-Fi for smoke, CO, and low-battery notifications, while two AA batteries provide backup during an outage. Voice alerts identify the hazard, giving occupants more information than the basic linked alarms in the X-Sense XP0H-WN three-pack, which has no phone connectivity.
Its hush function and sensing designed to reduce cooking-related nuisance alarms help with everyday use. Compared with the Kidde Ring battery detector, this model avoids relying on AA batteries as its primary power source, but installation is less flexible: it requires hardwiring and 2.4 GHz Wi-Fi for app connectivity. It is a single alarm, so covering several rooms means planning for additional compatible units.
Pros:- Detects smoke and carbon monoxide in one alarm
- Kidde app sends smoke, CO, and low-battery alerts
- Voice alerts identify the detected hazard
- Two AA backup batteries support operation during power outages
Cons:- Requires 120V AC hardwired installation
- App connectivity requires a 2.4 GHz Wi-Fi network
- Sold as one alarm rather than a multi-unit coverage pack
Best for: Homeowners replacing a hardwired alarm who want Kidde app notifications, voice hazard alerts, and battery backup
Not ideal for: Renters or buyers without compatible wiring, and households relying only on Wi-Fi bands other than 2.4 GHz
- Model:30CUAR-W
- Detection:Smoke and carbon monoxide
- Power:120V AC hardwired
- Backup batteries:Two included AA batteries
- Connectivity:2.4 GHz Wi-Fi and Kidde app
- Alerts:Smoke, carbon monoxide, low battery, and voice alerts
- Controls:Hush function
- Certifications:UL 217, UL 2034, and FCC standards
- Included items:Alarm, batteries, mounting bracket, wiring harness, user guide, and quick start guide
Our verdict“Choose this Kidde for an existing hardwired setup where app and voice alerts matter; choose a battery model if installation flexibility comes first.”
HEIMAN Matter over Thread Smart Smoke Detector
I’d pick the HEIMAN S1-M for a home already set up with Matter and Thread, where local automation matters more than app-based alerts. Its dual-beam photoelectric sensor is designed to detect fine smoke from smoldering fires, while the 85 dB alarm and one-touch test and silence controls keep basic operation straightforward. With a compatible Thread Border Router, it can join local smart-home automations rather than depending on a cloud connection for those routines. Compared with the First Alert SC5 Battery Smart Smoke and Carbon Monoxide Alarm, this is smoke-only and lacks that model’s CO detection and phone-alert feature. The tradeoff is ecosystem dependence: without a compatible Matter hub and Thread Border Router, its smart features are out of reach. I’d choose it for Thread users, not as a plug-and-play smart alarm.
Pros:- Dual-beam photoelectric sensing is designed to detect fine smoke from smoldering fires.
- Matter over Thread supports local smart-home automations with compatible equipment.
- Battery-powered design includes a CR123A battery.
- One-touch test and silence controls simplify routine use.
Cons:- Smart connectivity requires a compatible Matter hub with a Thread Border Router.
- Detects smoke only; it does not provide carbon monoxide monitoring.
- Its 85 dB alarm is the listed alert, with no phone-alert feature specified.
Best for: Households with a compatible Matter hub and Thread Border Router that want local smoke-alarm automations.
Not ideal for: Buyers seeking carbon monoxide detection, phone alerts, or smart features without adding compatible Thread hardware.
- Model:S1-M
- Connectivity:Matter over Thread
- Sensor:Dual-beam photoelectric
- Power:CR123A battery; included
- Alarm volume:85 dB
- Certification:UL 217 10th Edition; FCC
- Smart-home requirement:Compatible Matter hub with Thread Border Router
Our verdict“Choose the HEIMAN S1-M if your home already supports Matter over Thread and you want a locally automatable smoke-only alarm.”
First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm
For a home with existing alarm wiring, I’d favor the First Alert SC5 Hardwired when both smoke and carbon monoxide coverage are priorities. It combines the two sensors in one unit, sends First Alert app alerts, and uses voice warnings to identify the hazard and its location. Compatible alarms can sound together, helping an alert reach people beyond the room where danger starts; battery backup adds protection during a power outage. Compared with the battery-powered First Alert SC5 Battery Smart Smoke and Carbon Monoxide Alarm, this version fits an existing wired setup rather than relying on batteries as its primary power source. That advantage comes with an installation constraint: hardwiring may require existing wiring or professional work. I’d skip it for a rental or a home without suitable alarm connections.
Pros:- Smoke and carbon monoxide detection are combined in one alarm.
- App alerts and voice warnings identify the hazard and its location.
- Compatible interconnected alarms can sound together.
- Battery backup helps maintain protection during a power outage.
Cons:- Hardwired installation may require existing wiring or additional installation work.
- Battery backup does not make this a battery-primary alarm.
- Smart alerts rely on the First Alert app and compatible setup.
Best for: Homeowners replacing a hardwired alarm who want smoke and CO detection, app alerts, and compatible alarm interconnection.
Not ideal for: Renters and homeowners without existing alarm wiring who need a simple battery-powered installation.
- Model number:SMCO600NV-AC
- Alarm type:Smoke and carbon monoxide combination alarm
- Primary power:Corded electric
- Battery backup:3V lithium battery pack
- Connectivity:First Alert app alerts; compatible with Google’s Nest Protect Alarm
- Interconnection:Compatible alarms sound together
- Dimensions:5.75 × 1.6 × 5.75 in
Our verdict“Choose this SC5 if you have alarm wiring and want a connected smoke-and-CO replacement with backup power.”
First Alert SC5 Battery Smart Smoke and Carbon Monoxide Alarm
I’d put the First Alert SC5 Battery on the shortlist for buyers who want smoke and carbon monoxide monitoring without hardwired installation. It sends alerts through the First Alert app, and its voice warnings name the hazard and location, which can be more useful than a generic alarm when several rooms are involved. Compatible alarms can interconnect, while low-battery notifications help flag a maintenance need before a chirp interrupts the household. Compared with the hardwired First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm, this model is easier to place where wiring is unavailable, but it gives up the wired model’s primary electrical supply. It also depends on the app for phone alerts, so it is not a complete substitute for a loud local alarm. I’d choose it for flexible placement, not for a wired replacement.
Pros:- Detects both smoke and carbon monoxide in one device.
- App alerts and voice announcements identify the hazard and its location.
- Battery-powered installation avoids the need for alarm wiring.
- Low-battery notifications and compatible interconnection support ongoing household monitoring.
Cons:- Battery-powered rather than hardwired, unlike the other SC5 version.
- Phone alerts depend on the First Alert app and a suitable connected setup.
- The listed product data does not specify a battery-life duration.
Best for: Renters and homeowners who need a battery-powered smoke-and-CO alarm with app alerts and compatible interconnection.
Not ideal for: Buyers replacing an existing hardwired alarm who prefer a wired primary power source or do not want app-dependent alerts.
- Model number:SMCO600NV
- Alarm type:Smoke and carbon monoxide combination alarm
- Power:Battery powered
- Built-in batteries:3V CR123A lithium batteries
- Smartphone alerts:First Alert app
- Interconnection:Compatible alarms interconnect
- Dimensions:5.75 × 1.6 × 5.75 in
Our verdict“Choose the battery SC5 for app-connected smoke and CO protection in rooms where hardwiring is impractical.”
X-Sense SC07 Smoke and Carbon Monoxide Detector, 5-Pack
The X-Sense SC07 5-Pack makes sense when you need smoke and CO detection in several rooms but don’t need phone alerts or alarms that communicate with one another. Each unit pairs a photoelectric smoke sensor with an electrochemical CO sensor, and its LCD shows live CO readings in PPM plus battery level. That display gives occupants a clearer picture of CO levels than an alarm-only unit, while the sealed 10-year battery and no-rewiring installation reduce routine upkeep. Compared with the First Alert SC5 Battery Smart Smoke and Carbon Monoxide Alarm, the SC07 supplies five standalone alarms but lacks app notifications, voice location guidance, and interconnection. That limitation matters if you need an alarm in one room to alert people elsewhere. I’d choose this set for independent room coverage, not for a connected whole-home system.
Pros:- Five alarms provide smoke and CO detection for multiple rooms.
- LCD displays real-time CO readings in PPM and battery level.
- Sealed lithium battery is rated for 10 years.
- Mounts without rewiring and includes wall or ceiling installation hardware.
Cons:- Alarms do not wirelessly interconnect, so one unit will not trigger the others.
- No Wi-Fi, app alerts, or base-station support.
- Standalone alarms offer less whole-home coordination than the First Alert SC5 models.
Best for: Households that need several smoke-and-CO alarms, want visible CO readings, and can rely on local alarms rather than app alerts.
Not ideal for: Buyers who need alarms to communicate across rooms, receive phone notifications, or connect to a smart-home system.
- Model:SC07
- Pack quantity:5 detectors
- Alarm type:Smoke and carbon monoxide
- Sensors:Photoelectric smoke; electrochemical CO
- Battery:Sealed lithium, rated for 10 years
- Display:LCD with real-time CO readings in PPM and battery level
- Certifications:UL 217 and UL 2034
- Wireless connectivity:No wireless interconnection or Wi-Fi
Our verdict“Choose the SC07 set for several independently operating rooms where an LCD CO reading matters more than smart alerts or interconnection.”
HEIMAN Smart Carbon Monoxide Detectors, 3-Pack with Gateway
I’d choose the HEIMAN C1-R 3-pack for households seeking connected carbon monoxide coverage across multiple rooms, especially if they use Home Assistant, IFTTT, Google Home, or SmartThings. The three battery-powered detectors interconnect, and their gateway can send app alerts and provide alarm-log and battery monitoring. A stated 10-year sensor life and compact units suit buyers who want to add CO monitoring without running wires. Unlike the X-Sense SC07 5-Pack, this set offers a gateway and app features, but it detects carbon monoxide only—not smoke—so it cannot replace smoke alarms. The gateway is also required for app alerts and smart-home integration, adding another device and setup step. I’d treat it as a connected CO layer alongside dedicated smoke detectors, rather than a complete smart smoke-alarm solution.
Pros:- Three CO detectors interconnect so linked units can sound together.
- Gateway supports app alerts, alarm logs, and battery monitoring.
- Compatible with Home Assistant, IFTTT, Google Home, and SmartThings.
- Battery-powered units avoid wiring and use a FIGARO electrochemical sensor.
Cons:- Detects carbon monoxide only and does not replace smoke alarms.
- Gateway is required for app alerts and smart-home integration.
- Smart-home features may require compatible hub or ecosystem setup.
Best for: Smart-home users who want interconnected CO alarms in several rooms with gateway-based app alerts and monitoring.
Not ideal for: Anyone looking for smoke detection, a standalone smart detector without a gateway, or a single all-in-one smoke-and-CO alarm.
- Model:C1-R
- Included:3 CO alarms and 1 gateway
- Connectivity:2.4 GHz Wi-Fi
- Interconnect range:Up to 200 m / 656 ft
- Sensor:Japan-made FIGARO TGS5141 electrochemical sensor
- Stated sensor life:10 years
- Power:Battery operated; batteries included
- Smart-home compatibility:Home Assistant, IFTTT, Google Home, and SmartThings
- Certification and approval:UL 2034 5th Edition certified; CSFM approved
Our verdict“Choose this HEIMAN set as a connected CO-monitoring complement to separate smoke alarms, not as a smart smoke detector.”
Kidde Smart Smoke and CO Detector with Ring, Hardwired with AA Battery Backup
I’d choose this model when the existing hardwired alarm network matters as much as app access. It detects both smoke and carbon monoxide, sends Ring app alerts for alarms and low batteries without requiring a monitoring subscription, and can relay alerts from connected hardwired alarms. Alexa compatibility adds another way to hear about an event at home. Compared with the Kidde Smart Smoke Detector with Ring, AA Battery, this version adds CO detection and uses hardwired power, making it a better fit for replacing a compatible dual-sensor alarm. The tradeoff is installation: it needs a hardwired connection, while the battery model is easier to place where wiring is unavailable. Optional 24/7 monitoring costs extra, so its app alerts should not be confused with a staffed monitoring service.
Pros:- Detects smoke and carbon monoxide in one alarm.
- Ring app alerts for alarms and low batteries do not require a subscription.
- Can provide mobile alerts from connected hardwired alarms throughout the home.
- Designed to reduce cooking-related false alarms.
Cons:- Requires a hardwired connection, limiting placement and making installation less flexible than the battery-powered Ring model.
- 24/7 smoke and CO monitoring is optional and sold separately.
Best for: Homeowners with compatible hardwired alarms who want smoke and CO alerts across a Ring-connected home.
Not ideal for: Renters or anyone needing a detector for a location without hardwired alarm wiring; also skip it if you require 24/7 monitoring without an added subscription.
- Detection:Smoke and carbon monoxide
- Power:Hardwired with AA battery backup
- Connectivity:Ring app and Alexa-enabled devices
- Whole-home alerts:Mobile alerts for connected hardwired alarms
- False-alarm approach:Sensing technology designed to reduce cooking-related false alarms
- Certifications:UL 217 and FCC
- Optional monitoring:24/7 smoke and CO monitoring; sold separately
Our verdict“Choose this if you have compatible hardwired alarms and want Ring alerts for both smoke and CO, but not if you need wire-free placement.”
Kidde Smart Smoke Detector with Ring, AA Battery, RGSDR-RW
This is the more flexible Ring pick for buyers who want app alerts but cannot or do not want to connect an alarm to household wiring. It runs on two AA batteries and sends smoke and low-battery notifications through the Ring app without a subscription. Compatible Kidde alarms can wirelessly relay alerts, and Alexa support adds a convenient in-home notification path. Unlike the hardwired Kidde Smart Smoke and CO Detector with Ring, this model detects smoke only, so it does not replace a separate carbon monoxide alarm. Its cooking-related false-alarm reduction is useful near kitchens, though it does not eliminate nuisance alarms. Optional 24/7 smoke monitoring is a separate service, and battery changes remain part of ownership—unlike the sealed 10-year battery in the X-Sense SC07-W six-pack.
Pros:- Battery-powered installation does not require alarm wiring.
- Ring app smoke and low-battery alerts work without a subscription.
- Can wirelessly alert compatible Kidde alarms throughout the home.
- Alexa compatibility and cooking-related false-alarm reduction add practical notification flexibility.
Cons:- Detects smoke only, unlike the hardwired Kidde Ring model that also senses CO.
- Requires two AA alkaline batteries rather than a sealed long-life battery.
- 24/7 smoke monitoring requires an optional paid subscription.
Best for: Renters and homeowners who want Ring smoke and low-battery alerts in a location without hardwired alarm wiring.
Not ideal for: Buyers seeking one device for both smoke and CO, or anyone who prefers a sealed long-life battery over periodic AA replacement.
- Power:Two AA alkaline batteries, included
- Connectivity:Ring app
- Interconnection:Wire-free interconnection with compatible Kidde alarms
- Voice assistant:Alexa-enabled devices
- Certifications:UL 217 and FCC standards
- Detection:Smoke
- Optional monitoring:24/7 smoke monitoring; subscription required
- Detection-speed claim:Over 25% faster smoke detection based on internal testing versus a leading competitor
Our verdict“Pick this for wire-free smoke alerts in the Ring app, but pair it with a separate CO alarm if you need carbon monoxide detection.”
Kidde Hardwired App-Enabled Smart Smoke Detector with AA Battery Backup
I’d put this model on the shortlist for buyers who want remote smoke and low-battery alerts without tying the alarm to Ring. It connects directly to the Kidde app over 2.4 GHz Wi-Fi, while 120V AC power and two included AA backup batteries keep it suited to a hardwired installation. A hush button offers a quick response to a nuisance alarm, and its sensing technology is designed to reduce cooking-related triggers. Compared with the Ring-connected Kidde Smart Smoke and CO Detector, this alarm uses Kidde’s own app but is specified as a smoke detector rather than a smoke-and-CO model. That makes the choice straightforward: prioritize the app ecosystem and compatible Kidde wiring, or choose the Ring unit for CO detection. Wi-Fi band requirements and model-dependent interconnection compatibility are the main fit checks.
Pros:- Sends smoke and low-battery alerts through the Kidde app, including when away from home.
- AA backup batteries help keep the alarm powered during an outage.
- Hush button provides a way to silence false alarms.
- Sensing technology is designed to reduce cooking-related false alarms.
Cons:- App connectivity requires a 2.4 GHz Wi-Fi network.
- Interconnection compatibility and requirements vary by existing alarm model.
- Smoke detection only; a separate CO detector is needed for carbon monoxide coverage.
Best for: Homeowners with compatible hardwired Kidde alarms who want remote smoke and low-battery notifications in the Kidde app.
Not ideal for: People without hardwired alarm wiring, homes that rely on 5 GHz Wi-Fi only, or buyers who need carbon monoxide detection in the same unit.
- Model:20SAR-W
- Power:120V AC
- Backup batteries:Two AA batteries, included
- Connectivity:2.4 GHz Wi-Fi and Kidde app
- Interconnection:Compatible with existing Kidde hardwired alarms; requirements vary by model
- Detection:Smoke
- Certifications:UL 217 8th and 9th Edition; FCC standards
- End-of-life reminder:10 years after powered on
Our verdict“Choose this for app-connected smoke detection on a compatible hardwired Kidde system, but select a dual-sensor alarm if you also need CO detection.”
X-Sense SC07-W Interconnected Smoke and Carbon Monoxide Detectors, 6-Pack
The SC07-W takes a different route from the app-connected Kidde models: its priority is wireless whole-home alarm coverage, not remote phone notifications. This six-pack detects smoke and CO, and when one unit senses danger, the interconnected alarms sound together—useful for spreading a warning across a larger home. Each alarm includes a sealed 10-year lithium battery, so routine battery replacement is not part of the maintenance plan. Photoelectric smoke and electrochemical CO sensors, an LCD display, and UL 217 and UL 2034 compliance round out the package. Compared with the Ring-connected Kidde models, it gives you six coordinated alarms without wiring, but has no Wi-Fi or app alerts. The sealed battery also means you replace the unit rather than swap batteries when its power source reaches end of life.
Pros:- Six alarms can wirelessly interconnect so all units sound when one detects smoke or CO.
- Sealed 10-year lithium batteries avoid routine battery changes.
- Battery-powered installation requires no rewiring.
- Smoke and CO detection with an LCD display and UL 217 and UL 2034 standards.
Cons:- No Wi-Fi or smartphone alerts, unlike the Ring and Kidde app-connected options.
- Sealed batteries are not designed for routine replacement, so the alarm must be replaced when the battery reaches end of life.
Best for: Households wanting multiple interconnected smoke-and-CO alarms with long-life batteries and no reliance on Wi-Fi or household wiring.
Not ideal for: Buyers who need smartphone alerts while away, want to replace batteries themselves, or already have a system that requires app-connected alarms.
- Quantity:Six alarms
- Detection:Smoke and carbon monoxide
- Power:Sealed lithium battery with 10-year life
- Smoke sensor:Photoelectric
- CO sensor:Electrochemical
- Interconnection:Wireless RF
- Display and alarm volume:LCD display; 85 dB
- Certifications:UL 217 and UL 2034
- Dimensions:5.7 × 5.7 × 2 in
Our verdict“Choose this six-pack for coordinated, wire-free smoke and CO alerts across the home, but pick an app-connected model if you need notifications while away.”
How We Picked
I compared these 14 products on the factors that change a smoke-detector purchase: smoke and CO coverage, power source, alarm interconnection, remote notification, and smart-home compatibility. I also weighed installation demands, whether a product needs a gateway or relies on an existing platform, and how clearly a multi-pack can serve a whole-home plan. A detector that matches a home’s wiring and ecosystem is more useful than one with extra connected features the household cannot use.
The ranking favors practical coverage and fit over feature count alone. Combination alarms rank ahead of smoke-only choices for buyers seeking broader hazard detection, while hardwired and battery models serve different homes rather than one universally winning. Ring, Matter over Thread, and X-Sense options are separated by their connectivity approach and intended use. Since model names and bundles do not establish every compatibility or certification detail, buyers should check the current product specifications and local requirements before purchase.
| smart smoke detector | Detection | Certifications |
|---|---|---|
| X-Sense XP0H-WN Wireless Smoke | Smoke and carbon monoxide | — |
| Kidde Smart Smoke and CO Detec | Smoke and carbon monoxide | UL 217 and FCC standards |
| HEIMAN S1-TM Matter over Threa | Smoke | — |
| X-Sense Interconnected Smoke a | — | — |
| Kidde Hardwired Smart Smoke an | Smoke and carbon monoxide | UL 217, UL 2034, and FCC standards |
| HEIMAN Matter over Thread Smar | — | — |
| First Alert SC5 Hardwired Smar | — | — |
| First Alert SC5 Battery Smart | — | — |
| X-Sense SC07 Smoke and Carbon | — | UL 217 and UL 2034 |
| HEIMAN Smart Carbon Monoxide D | — | — |
| Kidde Smart Smoke and CO Detec | Smoke and carbon monoxide | UL 217 and FCC |
| Kidde Smart Smoke Detector wit | Smoke | UL 217 and FCC standards |
| Kidde Hardwired App-Enabled Sm | Smoke | UL 217 8th and 9th Edition; FCC standards |
| X-Sense SC07-W Interconnected | Smoke and carbon monoxide | UL 217 and UL 2034 |
Factors to Consider When Choosing Smart Smoke Detectors
Before choosing a model, map the alarms you need to replace and the way your home is wired. Connected features only help when they fit your household’s devices and routines; they do not replace correct placement, working alarms, or a suitable escape plan. These broader checks can prevent a technically capable detector from becoming the wrong purchase.
Match the power source to the home
Start by checking whether the existing alarms are hardwired, battery-powered, or a mix of both. A hardwired replacement may simplify installation where compatible wiring and mounting are already present, but it can be a poor fit if the connector or setup differs from the old alarm. Battery models can give renters and homes without alarm wiring more flexibility, though battery changes and low-battery alerts become part of ongoing upkeep. Backup batteries in hardwired units help maintain operation during outages, but they do not make wiring compatibility irrelevant. Avoid buying based on the word “hardwired” alone; verify the model’s installation instructions and the existing alarm’s connection before removing anything.
Choose smoke-only or smoke-and-CO coverage by location
Combination alarms can cover two hazards at one location, which may reduce the number of separate devices a household needs. That does not mean every room should automatically use the same alarm type: placement guidance and local rules can vary by room and building. Check which existing alarms detect carbon monoxide before replacing them with a smoke-only model. Also distinguish a multi-pack of combination detectors from a bundle that mixes device types or includes a gateway. A written room-by-room plan is a better starting point than choosing the largest pack and deciding where to put devices later.
Separate local interconnection from phone alerts
An interconnected alarm system can make alarms sound across linked devices when one unit detects a hazard, helping occupants hear an alert in another part of the home. Phone notifications serve a different purpose: they can notify someone who is away, but they depend on the product’s connectivity and the home’s network or hub setup. Do not treat a remote notification as a substitute for an audible alarm inside the home. Confirm whether the chosen models connect to one another, require a dedicated gateway, or depend on a third-party platform. For a household with sleeping areas far apart, prioritize a clear plan for whole-home audible warning before adding app features.
Check ecosystem fit before buying connected features
Ring, Matter over Thread, and manufacturer-specific systems do not automatically offer the same setup or controls. Buyers already using Ring may prefer a compatible Kidde model, while a Matter-focused household may favor a HEIMAN option if its requirements match the home’s Thread network and controller. X-Sense kits and app-connected models may follow a different setup path, so check whether a gateway or specific app is needed. A device can carry a smart-home standard and still require compatible equipment to expose the functions you want. Verify the exact model’s supported platforms and features rather than assuming that “smart” means it works with every app or voice assistant.
Plan coverage before choosing a multi-pack
Multi-packs can make it easier to equip several rooms with matching devices, but pack size is not a coverage plan. Count the alarms already installed, note which locations need smoke-only or combination detection, and check whether the new units can join the same alarm network. A five- or six-unit bundle may leave a gap if it does not match the home’s layout or existing wiring. Mixing brands can also complicate interconnection and app management, so check compatibility before combining devices. Buy for the locations and functions required, not simply for the number of units in the box.
Balance maintenance against smart features
Connected alerts can help identify a warning when nobody is close enough to hear a local alarm, but they add setup and maintenance tasks. App permissions, network access, account status, and any required gateway can affect the remote-alert experience. Battery-powered alarms need a dependable plan for battery replacement, while hardwired alarms still need their backup battery and alarm components maintained. Test each unit as directed by its manufacturer and follow the device’s replacement guidance. If the household is unlikely to maintain an app or hub, a simpler compatible alarm may serve better than a feature-rich model that is not kept connected.
Frequently Asked Questions
Should I choose a hardwired smart smoke detector or a battery-powered one?
Choose based on the alarm connection already installed and whether you own or rent the home. A compatible hardwired model can be a straightforward replacement where wiring is present, and battery backup can help during a power outage. A battery-powered model avoids relying on existing alarm wiring and may suit homes where hardwiring is unavailable or unsuitable. Before purchasing, check connector compatibility, mounting requirements, and whether local rules call for a particular installation. If you are unsure about electrical work or code requirements, ask a qualified installer.
Can a smart smoke detector alert me when I am away from home?
Some connected detectors can send remote alerts through an app or supported smart-home system, but the exact capability depends on the model and its setup. Check whether it needs a gateway, a compatible hub, an internet connection, or an account to deliver notifications. A phone alert is supplementary: it does not replace an audible alarm that warns people inside the home. Think through who will receive and respond to alerts when you are away. Confirm the model’s notification behavior and connectivity requirements before relying on it for remote awareness.
Will a Ring, Matter, or X-Sense detector work with the smart-home system I already have?
Not automatically; each product line can use a different platform, hub, or app. Ring-oriented Kidde models make the most sense for buyers who already use compatible Ring services, while a HEIMAN Matter over Thread model needs the relevant Matter and Thread setup for its supported functions. X-Sense models may use their own app or system requirements. Check the exact model number and the manufacturer’s current compatibility list, since support can differ between products from the same brand. Also confirm which features work through the platform you use, rather than assuming every alert or control carries over.
Is a smoke-and-CO detector a better replacement than a smoke-only alarm?
A combination detector can cover both hazards at one location, but it is only the right replacement if it suits that location and your home’s existing safety plan. Start by identifying which current alarms detect smoke, which detect carbon monoxide, and where each is installed. Replacing a combination alarm with a smoke-only unit could leave a coverage gap. At the same time, a combination model may not remove the need for other alarms required by the home’s layout or local rules. Follow the manufacturer’s placement instructions and check local requirements before changing the alarm arrangement.
Are multi-packs a good choice if I want alarms to sound throughout the house?
A multi-pack can simplify buying several matching detectors, but the number of units does not prove that they will interconnect or cover every required location. Check whether the particular models link to one another, whether that link is wired or wireless, and whether a gateway is needed. Confirm that each unit detects the hazards required in its intended room. If you are adding alarms to an existing system, verify cross-compatibility instead of assuming products from one brand will all connect. Plan locations first, then select a pack that matches both the coverage plan and the interconnection method.
Conclusion
For buyers who want broad coverage in an existing wired setup, my best overall choice is the First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm. For Ring households, the battery-powered Kidde Smart Smoke and CO Detector with Ring is the clearer fit; buyers who want a hardwired Ring option can compare its hardwired counterpart. The best value for multi-room planning is one of the X-Sense SC07 bundles, provided its detector type and interconnection features suit the home. For a smart-home-focused premium pick, consider the HEIMAN Matter over Thread model only if the home already supports its required ecosystem. For beginners, start with a battery-powered model that matches the household’s existing platform and has a setup path you can maintain. Choose by wiring, hazard coverage, and connectivity fit first; those decisions matter more than adding smart features that the home cannot use.
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