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Shelly has released the Presence Gen4, its first mmWave radar presence sensor, in North America. The company says it can detect up to 10 people across 10 customizable zones and supports Matter, with local-control options; independent performance testing is not included in the source report.
Smart-home company Shelly has released its first mmWave radar presence sensor, the Presence Gen4, in North America. The device is designed to detect up to 10 people across 10 customizable zones and supports Matter, giving users a way to build presence-triggered automations without relying solely on motion sensors.
According to Matter Alpha’s report, the sensor can detect small movements even when a person is sitting still, and its app displays occupancy by configured area. Users can set automations to respond when someone enters or leaves a zone. Shelly also says the device has height settings that can help include or filter out pets, robot cleaners, and other small objects. A built-in light sensor can detect changes in room lighting.
The Presence Gen4 has a 140-degree horizontal field of view when wall-mounted and is specified to cover up to 650 square feet. Corner placement narrows the view to 90 degrees, with a stated coverage area of up to 525 square feet. The unit measures 64 by 41 by 26 millimeters, or 73 by 41 by 37 millimeters with its stand, and uses a USB-C power connection.
The sensor includes Wi-Fi, Bluetooth and Zigbee radios, alongside Matter support. The report lists compatibility with Google Home, Amazon Alexa, Apple Home, Samsung SmartThings and Home Assistant, and says other Matter-compatible systems may also connect. Shelly offers local control and custom scripting options. Matter Alpha reports a recommended retail price of $84.99 and says the product is available through Shelly’s U.S. store, with Amazon also listed as a place to buy it.
Zone Detection Changes Home Automations
The product’s main distinction is its focus on where people are in a room, not just whether movement occurred somewhere nearby. If the advertised zone detection works reliably in a given home, automations could respond to occupancy in specific areas—for example, controlling lights or climate settings in one part of an open-plan room while leaving another area unaffected.
That approach could also make presence-based automation useful when someone is relatively still, a situation in which conventional motion-triggered systems may fail to register continued occupancy. The device’s Matter support and local-control options may appeal to owners seeking integrations across smart-home platforms or reduced dependence on cloud services. Those are potential advantages, not independently verified outcomes: the source report provides product specifications and Shelly’s claims, but no comparative test results or privacy audit.
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From Motion Sensing to Presence
Many basic smart-home motion sensors trigger when they detect movement, then rely on a timer before treating a space as empty. Shelly’s Presence Gen4 instead uses millimeter-wave radar, a technology that detects movement associated with a person’s presence, including very small movements, according to the product report. This can support automations that aim to keep lights or other systems active while someone remains in a room.
The launch is Shelly’s first mmWave sensor, according to Matter Alpha. Its stated support for up to 10 people and 10 zones distinguishes the device’s intended use from a simple single-room occupancy trigger, though actual results will depend on installation, configuration and the room itself. The source describes positioning options and coverage specifications but does not provide a hands-on test or a direct comparison with competing sensors.
“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, chief marketing officer of Shelly USA, as quoted by Matter Alpha
Matter compatible occupancy sensor
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Real-World Accuracy Still Untested
The product specifications describe the sensor’s stated range, field of view and maximum number of people and zones, but the source report does not include independent accuracy tests. It is not clear how reliably the device distinguishes people from pets or small objects in different layouts, or how performance changes with furniture, walls, installation height and placement.
The report also does not detail how long occupancy data is stored, what information is sent to Shelly’s cloud when cloud services are used, or whether all listed smart-home features operate locally. Shelly’s local-control option may reduce reliance on cloud services, but the available source does not provide a technical privacy or security review. Availability beyond the U.S. market and the timing of broader retail distribution are also not specified.
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Availability and Testing Ahead
The Presence Gen4 is listed as available now in North America at a recommended price of $84.99, according to Matter Alpha. The report points readers to Shelly’s U.S. store and Amazon, but does not give a schedule for availability in other countries.
The next useful evidence will come from hands-on testing of detection accuracy across different rooms, zone configurations and household conditions, along with checks of Matter integrations and local operation. Buyers considering the device should confirm current availability, platform compatibility and the specific features supported by their chosen smart-home system.
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Key Questions
What is the Shelly Presence Gen4?
It is Shelly’s first mmWave radar presence sensor, released in North America. It is intended to detect people in a room and trigger smart-home automations based on occupancy.
How many people and zones can it track?
Shelly’s stated maximum is 10 people across 10 customizable zones. The source report does not provide independent testing of those limits in real homes.
Does the Presence Gen4 work with Matter?
Yes. Matter Alpha reports that the device supports Matter and lists Google Home, Amazon Alexa, Apple Home, Samsung SmartThings and Home Assistant among compatible platforms. Specific features may depend on the connected system.
Can it operate without cloud services?
The report says the sensor supports local control and describes a cloud-free local option. It does not detail which features work locally or provide an independent privacy and security assessment.
How much does it cost?
Matter Alpha gives the Presence Gen4 a recommended retail price of $84.99 and reports that it is available now in North America. Prices and stock may vary by retailer.
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