Shelly's new $84.99 mmWave radar sensor detects up to 10 people across 10 customizable zones, supports Matter and multiple smart home ecosystems, and enables privacy-friendly automation for lighting, climate control, and more.
Smart home automation has come a long way, but one problem still frustrates homeowners: getting smart devices to recognize when someone is actually in a room.
Traditional motion sensors work well when someone walks through a doorway or crosses a room. But what happens when you're sitting at your desk, reading on the couch, or watching television without moving much? Depending on the sensor and automation settings, your smart lights might turn off because the system no longer detects movement.
That's the problem Shelly is trying to solve with its newest addition to the Gen4 smart home portfolio: the Shelly Presence Gen4, a millimeter-wave (mmWave) radar sensor designed to detect human presence, track occupants across different areas of a room, and trigger automations without using cameras.
Launched in North America on October 15, 2026, the Shelly Presence Gen4 costs $84.99 and combines advanced occupancy detection with Wi-Fi, Bluetooth, Zigbee, and Matter connectivity. It also supports local control, letting homeowners create automations without relying on the cloud.
But is it the right presence sensor for your smart home? And will it work with the smart home ecosystem and devices you already own?
This GearBrain buying guide explains what the Shelly Presence Gen4 does, how it works, which features matter most, and what to check before you buy.
Shelly Presence Gen4 www.gearbrain.com
Feature | Shelly Presence Gen4 |
|---|---|
Product | Smart home presence and occupancy sensor |
Detection technology | mmWave radar |
Simultaneous detection | Up to 10 people |
Customizable detection zones | Up to 10 |
Occupancy visualization | Real-time occupancy map |
Connectivity | Wi-Fi, Bluetooth, Zigbee, Matter |
Local control | Supported |
Ambient light sensor | Built in |
Pet filtering | Adjustable detection settings |
Wall-mounted coverage | Up to 650 sq. ft., 140° |
Corner-mounted coverage | Up to 525 sq. ft., 90° |
Power | USB-C |
Colors | Black and white |
Price | $84.99 |
Availability | Shelly's U.S. website; additional retailers planned |
What is Shelly Presence Gen4? www.gearbrain.com
Shelly Presence Gen4 is a smart home occupancy sensor that uses mmWave radar to detect whether people are in a room and where they are.
Unlike traditional motion sensors, which typically respond to noticeable movement, mmWave radar can detect subtle movements from a person sitting or standing relatively still.
This makes the technology especially useful in rooms where occupants stay still for long periods, including home offices, bedrooms, living rooms, and entertainment spaces.
Shelly Presence Gen4 goes beyond simple occupied-or-empty detection. Shelly says the sensor can detect up to 10 people at once and divide its detection area into 10 independently customizable zones.
For example, you could create separate detection zones for a desk, couch, and reading chair within the same room. Each zone could trigger a different smart home automation.
The sensor also creates a real-time occupancy map showing where people are detected without capturing video images.
That last feature matters especially for homeowners who want smarter automation without installing indoor security cameras.
The Presence Gen4 uses millimeter-wave radar signals to detect movement and determine occupancy within its coverage area.
Because radar can detect subtle movements, the sensor can keep detecting someone working at a computer or sitting on a couch, even when they aren't walking around.
The system then uses that presence information to trigger connected smart home devices based on the automations you've configured.
For example, imagine a home office equipped with smart lighting and a compatible thermostat.
When you enter the office, Presence Gen4 could trigger the lights and adjust the room's temperature. When you sit at your desk, the sensor could keep recognizing your presence instead of switching everything off when a traditional motion sensor's inactivity timer expires.
When the room becomes empty, an automation could turn off unnecessary lights or adjust climate settings to reduce energy consumption.
The key distinction is that Presence Gen4 detects occupancy rather than relying only on obvious movement.
One of the biggest advantages of the Shelly Presence Gen4 is its ability to detect people who are sitting still or making very small movements. This is an important difference between mmWave radar presence sensors and traditional passive infrared (PIR) motion sensors commonly used in smart homes.
Traditional PIR motion sensors detect changes in infrared energy as people move through their detection area. They're effective for triggering lights when someone enters a hallway, bathroom, or room. However, they can struggle to detect someone who stays relatively still.
For example, imagine you're working at your desk, reading a book, or watching television. A conventional PIR motion sensor may stop detecting activity after you've been sitting still for several minutes. Depending on your automation settings, the system might assume the room is empty and turn off the lights or change the thermostat.
Shelly Presence Gen4 uses mmWave radar technology to detect subtle movements, helping it recognize that someone is still present even when they're not walking around.
This enables more reliable occupancy-based automations for rooms where people spend extended periods sitting or working.
Consider a home office equipped with smart lights.
With a traditional PIR sensor, the lights might turn on when you enter the office but turn off after a period of inactivity, even though you're still sitting at your desk.
With Shelly Presence Gen4, the sensor can keep detecting your presence through subtle movements, so compatible smart lights stay on while the room is occupied.
Its customizable detection zones also allow you to create different lighting automations for specific areas, such as a desk, reading chair, or seating area.
Presence detection can also make heating and cooling automations more responsive.
Imagine you're sitting in your living room watching a movie. A basic motion sensor might stop registering activity because you're not moving around.
If your smart home uses motion-based occupancy rules to adjust the thermostat, it could incorrectly assume the room is empty and activate an energy-saving temperature setting.
Shelly Presence Gen4 can help prevent this by continuing to detect an occupant who is sitting relatively still.
When integrated with a compatible thermostat or HVAC control system, the sensor could help maintain comfortable temperatures while a room is occupied and trigger energy-saving settings when everyone leaves.
Actual HVAC behavior and potential energy savings depend on the connected equipment, automation platform, and configuration.
Understanding the difference between presence detection and motion detection is one of the most important considerations when shopping for smart home sensors.
Feature | Traditional PIR motion sensor | Shelly Presence Gen4 |
|---|---|---|
Primary function | Detects changes in infrared energy associated with movement | Detects presence using mmWave radar |
Stationary occupant detection | Can be unreliable | Designed to detect subtle movements |
Multiple occupancy zones | Typically limited or unavailable | Up to 10 zones |
Multiple people | Usually detects activity without tracking individual positions | Detects up to 10 people |
Room-based automations | Yes | Yes, with zone-level customization |
Camera required | No | No |
Setup complexity | Generally simpler | More configuration options |
Traditional PIR motion sensors still make sense for hallways, closets, entryways, and other spaces where detecting movement is sufficient.
But in rooms where people sit still for extended periods, a presence sensor can enable more reliable occupancy-based automations.
Presence Gen4 is particularly interesting because it combines that capability with multi-zone detection.
7 Shelly Presence Gen4 Features That Matter Most www.gearbrain.com
Shelly says Presence Gen4 can recognize up to 10 people within its detection area.
This could help in shared living spaces, conference rooms, home offices, and entertainment rooms with multiple occupants.
However, detecting multiple people is not the same as identifying who they are. Shelly's announcement describes occupancy and location detection, not personal identity recognition.
One of Presence Gen4's most useful features is the ability to divide a room into up to 10 independently configurable zones.
Instead of treating an entire room as one automation area, homeowners can create different behaviors based on where people are.
For example, a reading chair could activate a nearby lamp, while occupancy near a desk could trigger task lighting.
The actual automations available will depend on the connected devices, integrations, and rules you configure.
Privacy is an increasingly important consideration when adding sensors and connected devices to a home.
Shelly Presence Gen4 provides occupancy information using radar instead of capturing video footage.
Its real-time occupancy map represents detected positions without requiring a camera.
For homeowners who are uncomfortable installing cameras in bedrooms, living rooms, or home offices, this is a meaningful alternative.
Keep in mind that camera-free does not mean the device collects no information. Occupancy patterns can still reveal when spaces are being used, so homeowners should review the device's privacy and data-handling settings.
Shelly says Presence Gen4 supports cloud-free local control.
That means supported local automations can operate without requiring continuous access to an external cloud service.
This can appeal to homeowners who prioritize privacy, want more control over their smart home infrastructure, or prefer automations that don't rely entirely on internet connectivity.
The exact behavior depends on the integration and automation platform you use.
Homes with dogs, cats, and robot vacuums can challenge occupancy sensors.
Shelly includes adjustable minimum and maximum height detection thresholds and other configuration options intended to help filter out pets, robotic cleaners, and low-to-the-ground objects.
This gives homeowners more control over what the sensor responds to.
However, successful filtering may depend on the animal's size, sensor placement, and room configuration. GearBrain has not independently tested these settings.
Presence Gen4 includes an ambient light sensor that reports dark, twilight, and bright conditions.
This adds another useful input for smart lighting automations.
Instead of turning on lights whenever someone enters a room, you could configure an automation to consider both occupancy and lighting conditions.
For example, lights might stay off during daylight hours but turn on after sunset when the room gets darker.
Shelly designed Presence Gen4 for several installation options, including wall mounting, corner mounting, and placement on a flat surface using its built-in stand.
According to Shelly:
The sensor requires continuous USB-C power, so you'll need to consider outlet access and cable placement.
This is one of the most important questions to answer before buying any smart home device.
A sensor can offer impressive technology, but it only becomes useful when it can communicate with the devices and automation systems already installed in your home.
Shelly Presence Gen4 supports several major smart home connectivity technologies:
Shelly also lists interoperability with Amazon Alexa, Google Home, Apple Home, Samsung SmartThings, and Home Assistant.
This makes Presence Gen4 potentially appealing to households that use more than one smart home ecosystem.
However, support for Matter or an ecosystem does not automatically guarantee that every Presence Gen4 feature will be available through every platform.
Basic occupancy information may be exposed differently from advanced capabilities such as multiple detection zones, occupancy mapping, and configurable height thresholds.
Before buying, verify whether your preferred smart home platform supports the specific Presence Gen4 features you want to use.
GearBrain's patented IoT Compatibility Find Engine helps consumers discover smart devices and understand how products work with different ecosystems and connected home technologies.
Before purchasing Shelly Presence Gen4, you can use the GearBrain Compatibility Find Engine to research your existing smart home ecosystem and compatible devices.
If Presence Gen4 isn't yet listed in the database, confirm the latest compatibility information with Shelly or let us know, and we will find out.
You can also explore GearBrain Assistant, our AI-powered smart home assistant in beta, designed to help consumers understand device compatibility and make better connected-home purchasing decisions.
The real value of a presence sensor comes from the automations it enables. Here are six practical scenarios where Presence Gen4 could make a difference.
1. Home office automation
Keep lights on while working at your desk, even when you're sitting still. Turn them off automatically when the office becomes empty.
2. Zone-based living room lighting
Configure different lighting scenes for a sofa, reading chair, or entertainment area based on where occupants are detected.
3. Bedroom lighting
Use occupancy and ambient light conditions to create gentle nighttime lighting without installing an indoor camera.
4. Climate and energy management
Adjust compatible heating and cooling systems based on whether rooms are occupied or empty. Actual savings will depend on your HVAC system and automation settings.
5. Open-plan room automation
Divide a larger space into zones so lighting and other connected devices respond to activity in different areas.
6. Pet-friendly automations
Adjust detection thresholds to help reduce unwanted triggers from pets and robot vacuums.
Although the Presence Gen4 offers compelling features, it may not be the right choice for every smart home.
Measure the room and consider where you'll install the sensor.
Shelly's launch information specifies coverage of up to 650 square feet when wall-mounted, but its technical documentation also lists a detection area of about 42 square meters (452 square feet). Because these published figures differ, confirm the effective coverage for your intended installation with Shelly.
Furniture, room layout, mounting position, and detection settings can also affect results.
Presence Gen4 isn't described as a battery-powered sensor. It requires a continuous USB-C power connection.
Shelly recommends a dedicated, stable 5V power adapter rather than an adapter whose output may fluctuate.
Shelly's documentation confirms Matter-over-Wi-Fi support. By default, only one room zone is visible to a Matter-compatible home automation system. You must configure additional zones to expose them as separate components.
This distinction matters for Apple Home, Alexa, Google Home, and SmartThings users who expect all advanced sensor capabilities to appear automatically.
Multi-zone detection, sensitivity adjustments, room boundaries, and pet filtering add flexibility, but they also create more setup decisions.
If you only need a light to turn on when someone enters a hallway, a simpler motion sensor may be more practical and less expensive.
Presence Gen4 doesn't use a camera, and Shelly supports local operation. Still, review how your chosen integrations process occupancy information and whether they enable any cloud services.
Type of buyer | Our assessment |
|---|---|
Smart home enthusiasts | Strong candidate for advanced room and zone automations |
Home office users | Particularly useful for stationary occupancy detection |
Apple Home and Matter users | Worth considering after checking feature support |
Home Assistant users | Appealing for customizable automations and local control |
Privacy-conscious homeowners | Camera-free sensing and local control are attractive |
Pet owners | Adjustable filtering may help reduce false triggers |
Buyers needing simple hallway motion detection | A basic motion sensor may be sufficient |
Buyers seeking battery-powered sensors | Not a fit because USB-C power is required |
Available in black and white, with a three-year manufacturer warranty listed on Shelly's U.S. product page.
Shelly launched Presence Gen4 in North America on October 15, 2026. Shelly announced additional retail availability at Micro Center, Best Buy, Newegg, and Amazon, but shoppers should verify current listings.
Shelly Presence Gen4 is a smart home sensor that uses mmWave radar to detect people and their locations within a room. It supports up to 10 occupants and 10 customizable detection zones.
Traditional motion sensors generally detect movement, while Presence Gen4 uses radar to detect subtle movements associated with someone who is sitting or standing relatively still. This can help prevent automations from turning off lights while a room remains occupied.
Yes. Shelly identifies Presence Gen4 as Matter-certified and documents Matter-over-Wi-Fi connectivity. After configuration, you can expose additional room zones as separate components, but you should verify platform support.
Shelly lists Apple Home as a supported smart home ecosystem through Matter. Users should confirm which features are available in their Apple Home setup, especially multi-zone automations.
Yes. Shelly's North American announcement specifies simultaneous detection of up to 10 people.
Yes. Detecting relatively stationary occupants is one of the sensor's primary capabilities.
No. It uses mmWave radar, not video imaging, to detect occupancy and generate its occupancy map.
Shelly supports local control and provides an embedded web interface. Supported local operations can function without a cloud connection, although individual integrations and remote-access features may have different requirements.
Shelly says the device can operate independently over Wi-Fi. However, connecting it to certain Zigbee or Matter ecosystems may require an appropriate controller or hub.
It includes configurable sensitivity and height-based filtering intended to reduce detections caused by pets and robot vacuums. Results will depend on configuration and the environment.
No. It requires continuous USB-C power.
The announced U.S. retail price is $84.99.
GearBrain's Take: Is Shelly Presence Gen4 Worth Buying? www.gearbrain.com
Shelly Presence Gen4 solves a real problem in smart home automation: traditional motion detection doesn't always provide enough information to tell whether a room is occupied.
Its combination of mmWave radar, multi-person detection, customizable zones, ambient light sensing, and support for multiple connectivity protocols makes it an interesting option for homeowners looking to create more responsive automations.
Its ability to detect people without cameras is another key advantage, especially in private living spaces.
At $84.99, Presence Gen4 is most compelling for buyers who plan to use its advanced capabilities rather than simple motion-triggered lighting.
There are also practical considerations. The sensor needs continuous power, multi-zone automations require configuration, and you should verify the exact capabilities available through each smart home ecosystem.
Our preliminary assessment: Shelly Presence Gen4 looks particularly promising for home offices, living rooms, and other spaces where traditional motion sensors struggle to detect people sitting still. However, GearBrain hasn't independently tested the product, so its detection accuracy, pet filtering, and real-world reliability remain unproven.
The most important question before purchasing isn't simply whether the sensor supports Matter, Alexa, Apple Home, or SmartThings.
It's whether Shelly Presence Gen4 can trigger the specific automations you want using the smart home devices you already own.
That's where understanding device compatibility becomes essential.
Editor's note: This buying guide is based on Shelly's October 15, 2026 North American product announcement and published technical documentation. GearBrain has not conducted a hands-on review. Specifications, ecosystem functionality, pricing, and availability may change. Published coverage figures differ between Shelly's launch materials and technical documentation; buyers should verify installation requirements before purchasing.
Plus, check out The GearBrain, our smart home compatibility find engine, to see the other compatible products that work with Amazon Alexa and Google Assistant-enabled devices.
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