SwitchBot Presence Sensor W820000 mmWave Presence Detector with PIR, Light Sensor, Matter, IP55

The SwitchBot Presence Sensor is designed for users who want more from a smart home than basic motion detection. It combines three detection technologies, offers long battery life, supports flexible installation, and enables quick automation without a hub in simpler scenarios. It is especially useful in places where standard sensors may fall short, such as the bathroom, home office, living room, or reading nook, anywhere you may remain still for longer periods. It is a practical solution for better comfort, improved control of lighting and devices, and privacy without cloud storage or recording.

Unlike standard motion sensors, SwitchBot uses an advanced 3-in-1 system that combines a light sensor for ambient light detection, a PIR sensor for fast motion detection, and mmWave radar for presence detection. This improves speed and accuracy because the device can detect not only movement, but also the presence of a person standing still. The sensor can even detect the chest movements of a stationary person, making it suitable for bathing, working at a desk, resting, or reading. This helps prevent situations where the light turns off simply because you have not moved for a moment.

The sensor is able to distinguish between ordinary movement and actual human presence in the room. This is particularly important in spaces where you often stay still, such as the bathroom, home office, bedroom, or living room. With mmWave technology supported by PIR and a light sensor, it can keep lights on or activate devices exactly when needed, reducing unwanted interruptions and accidental shutdowns.

SwitchBot offers a wide 120° detection angle, helping cover a larger area without complicated installation planning. The detection range is up to 8 meters for moving people and up to 5 meters for stationary people, so it can work effectively in both smaller rooms and more open areas. These parameters make it suitable for a variety of everyday uses, from entrance lighting control to remote work comfort and general home automation.

The battery-powered design gives you more freedom when choosing the installation spot, without the need to run a power cable. The sensor can be mounted on a bookshelf, desk, or metal shelf using the strong magnetic mount, and it can also be safely used in the bathroom thanks to its IPX5 rating. The energy-efficient mmWave radar with ultra-low power consumption allows operation for up to 2 years on a single battery change. This makes installation easier and lets you move the sensor between rooms when your needs change.

The magnetic base provides flexible positioning. You can place the sensor flat, mount it on the wall, and adjust the detection angle to better match the layout of your room. This helps adapt the detection zone to bathrooms, living rooms, home offices, and other spaces, while also reducing accidental activations and improving everyday automations.

The SwitchBot Presence Sensor supports instant device-to-device automation without the need for a hub. This means fast response times measured in seconds and simple local scenarios. It can work directly with selected SwitchBot devices and supports up to 2 automations. For more advanced setups involving multiple devices, it can also work with the SwitchBot Hub, enabling more complex scenes such as turning on lights and an air purifier at the same time.

An AI self-learning feature can be activated with one click to help filter out interference caused by fans, air conditioners, and other movement sources unrelated to human presence. This improves detection accuracy and reduces unnecessary triggers. Combined with the ability to rotate the sensor and adjust the detection area, the magnetic base also helps reduce false activations caused by pets.

The sensor supports Matter and works with Alexa, Google Home, Home Assistant, and SmartThings, making it easy to integrate into an existing smart home system. Apple Home support is available via the SwitchBot Matter Hub. SwitchBot also keeps data local, without cloud storage or recording, which is especially important in rooms such as the bathroom, bedroom, or home office where privacy matters.

Specifications:

• Manufacturer: SwitchBot
• Model: W820000
• Dimensions: 54 × 54 × 28 mm
• Weight: 38 g
• Material: UV-resistant ABS
• Water resistance: IP55
• Button: Reset button for pairing or resetting
• Local connection: Supports SwitchBot Bot, Relay, and Light devices
• Automation: Works with all SwitchBot devices
• Third-party service support: Alexa, Google, Siri, IFTTT, SmartThings
• Operating temperature: 0–40°C
• Operating humidity: 10%–90% relative humidity, non-condensing
• Power supply: 2 AAA batteries
• Battery life: Up to 2 years
• Range: Up to 100 m