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Shelly has released the Presence Gen4, its first mmWave radar sensor, in North America for $84.99. The company says it can detect up to 10 people across 10 customizable zones and supports Matter, with local-control options; independent performance testing was not provided in the report.
Smart-home company Shelly has released the Presence Gen4, its first mmWave radar presence sensor, in North America. Shelly says the device can detect up to 10 people across 10 customizable zones and works with Matter-compatible smart-home systems, offering a way to trigger automations based on occupancy rather than movement alone.
The Presence Gen4 is listed at a recommended retail price of $84.99 and is available through Shelly’s U.S. website, according to the report. The device combines Wi-Fi, Bluetooth and Zigbee radios with Matter support. The report names Google Home, Amazon Alexa, Apple Home, Samsung SmartThings and Home Assistant among the platforms it can connect with, while noting that other Matter-compatible systems may also work.
Shelly’s reported specifications include detection across 10 user-defined zones and the ability to track up to 10 people at once. The company also lists adjustable minimum and maximum detection heights, which users can configure to include or filter out pets and smaller objects such as robot cleaners. A built-in light sensor can detect changes in room lighting.
The sensor can be wall-mounted, with a stated 140-degree horizontal field of view and coverage of up to 650 square feet. The report gives a narrower 90-degree field and coverage of up to 525 square feet for corner mounting. The compact unit measures 64 by 41 by 26 millimeters, or 73 by 41 by 37 millimeters with its stand. It is powered by USB-C, so placement also depends on access to a power supply.
Occupancy-Based Home Automations
Presence sensors can support automations that respond to whether someone remains in a room, rather than only to a recent movement event. That distinction could matter for lighting, heating and cooling, curtains, or entertainment systems: an occupancy-based setup may keep a room’s settings active while someone is sitting still and turn them off after the space becomes empty.
The multi-zone design could allow a smart-home system to respond differently to people in separate parts of a larger room. Shelly also advertises local control and custom scripting, which may appeal to users seeking automations that do not depend entirely on cloud services. The report describes the local option as a privacy and resilience benefit, but does not provide a technical account of which functions remain available offline or how data is handled.
Shelly’s claims about detection range, simultaneous tracking and reliability are relevant to buyers comparing the device with motion sensors or video-based monitoring. The source report does not include independent test results, so real-world accuracy across different room layouts and mounting positions remains unverified.
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How Shelly Describes mmWave
Unlike a conventional motion sensor that responds to movement, mmWave radar is designed to detect small movements and maintain a presence reading when a person is still. The source report describes the technology as using electromagnetic waves with wavelengths of 1 to 10 millimeters, corresponding to frequencies of 30 to 300 gigahertz. The practical distinction is that a person sitting quietly may remain detectable, depending on the sensor and conditions.
The Presence Gen4’s advertised capabilities combine that radar sensing with configurable zones and integrations. Shelly says users can set automations to react when people enter or leave a defined area. Examples in the report include switching lights or climate controls according to occupancy, and reducing energy use in empty rooms. These are potential uses, not evidence that the sensor will deliver a particular level of accuracy or energy savings in every home.
“Accurate presence detection unlocks the kind of smart home experience customers have long dreamed about, where everything from lighting to HVAC respond automatically without needing to lift a finger.”
— Matt Brown, CMO of Shelly USA
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Performance Testing Still Pending
The source report gives Shelly’s specifications and feature claims but does not describe independent testing of detection accuracy, false positives, or the stated coverage areas. It is also unclear how consistently the sensor can separate multiple people across zones in real homes, where walls, furniture, pets and installation height may affect results.
The report says the device offers a cloud-free local option, but does not detail which integrations or features work without an internet connection, what information is stored, or how long it is retained. It also does not provide a confirmed Amazon availability date; the listing says the product is available through Shelly’s U.S. site and mentions Amazon availability without a clear timing detail.
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Availability and User Testing
The Presence Gen4 is available now through Shelly’s U.S. website at the stated $84.99 retail price. Prospective buyers can check the retailer’s current listing for stock, purchase terms and any updates about Amazon availability. Shelly’s product information and Matter compatibility details should also clarify which features work with a buyer’s particular smart-home platform.
Further evidence will come from hands-on use and testing across different room sizes, layouts and smart-home setups. Those results could help establish how well the advertised multi-person tracking, zone detection and local operation perform beyond the manufacturer’s specifications.
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Key Questions
What is the Shelly Presence Gen4?
It is Shelly’s first mmWave radar presence sensor, designed to detect people in indoor spaces and trigger smart-home automations.
How many people and zones can it track?
Shelly says the sensor can detect up to 10 people at once across up to 10 customizable zones. The source report does not include independent testing of those limits.
Does the Presence Gen4 support Matter?
Yes. The report says the device supports Matter and lists Google Home, Amazon Alexa, Apple Home, Samsung SmartThings and Home Assistant among supported platforms.
Does it need cloud access to work?
Shelly advertises a cloud-free local-control option. The available report does not specify which features and integrations continue to work without an internet connection.
How much does it cost?
The reported recommended retail price is $84.99. It is listed as available through Shelly’s U.S. website; the report does not give a confirmed date for Amazon availability.
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