Motion Sensor SwitchBot W820000 — Wireless Smart Motion Detector for Automation and Alerts

The SwitchBot Motion Sensor W820000 is a wireless smart motion detector designed for home and office automation. It combines three detection technologies (light sensor, PIR motion sensor and mmWave radar) to detect both movement and presence, enabling more reliable lighting control, security alerts and energy-saving automations. Compact and battery-powered, it supports local device-to-device automations and integrates with popular smart home platforms for extended scenarios.

Advantages

The sensor’s 3-in-1 detection system reduces missed presence events and unwanted light shutdowns by distinguishing between brief movement and a person remaining still. Long battery life and low-power mmWave operation allow up to two years of use on replaceable AAA batteries, while a magnetic mount and IP55 water resistance offer flexible placement options, including damp rooms. The device supports direct, fast automations without a hub for simple setups and can be connected to a hub for broader smart home integration.

Suitable for

• Lighting automation in bathrooms, hallways and living rooms where people may remain stationary
• Presence-based control in home offices and bedrooms
• Security alerts and motion-triggered notifications for small apartments or offices
• Energy-saving automations that turn devices off when no presence is detected

When it may not be suitable

The sensor is optimized for indoor use and although it has IP55 resistance for protection against splashes, it is not intended for continuous outdoor exposure or installation in fully wet environments. For very large open areas or locations requiring detection beyond the specified ranges for motion and presence, multiple sensors or alternative sensing solutions may be required to achieve full coverage.

Key specifications

• Dimensions: 54 × 54 × 28 mm
• Weight: 38 g
• Materials: UV-resistant ABS
• Detection technologies: light sensor, PIR motion sensor, mmWave radar
• Detection angle: up to 120°
• Detection range: moving people up to 8 m; stationary presence up to 5 m
• Operating temperature: 0–40°C
• Operating humidity: 10%–90% RH (non-condensing)
• Ingress protection: IP55
• Power: 2 × AAA batteries; battery life up to 2 years
• Wireless range: up to 100 m (line of sight, depends on environment)
• Installation: magnetic base for flat or wall mounting

How to use

Place the motion sensor where it has a clear view of the monitored zone and attach it using the magnetic base or mount on a wall or metal surface. Insert two AAA batteries and follow the pairing procedure in the SwitchBot app to add the device to your setup. Configure up to two direct automations with other SwitchBot devices for fast, local reactions, or connect the sensor to a SwitchBot Hub to create broader scenes and use third‑party integrations. Adjust mounting angle and location to reduce false activations from pets or moving appliances and enable AI self-learning in the app to further reduce interference.

What to consider before purchase

• Intended installation location (indoor, occasional splashes only) and required detection range
• Whether you need direct device-to-device automations only or broader hub-based integrations
• Battery replacement access and expected lifespan based on usage patterns
• Compatibility with existing smart home platforms in your setup

Usage recommendations

Mount the sensor at a height and angle that covers the primary activity zone (for example, near a desk or entrance). Use the magnetic base to test different positions before final installation and enable AI self-learning to minimize false triggers from fans or pets. For coverage of larger rooms, use additional sensors or combine with other SwitchBot devices via a hub.