Know the moment something moves. The eufy Security Motion Sensor T8910021 is the wireless add-on sensor for eufy Security HomeBase systems — a compact, battery-powered indoor motion detector that covers a 100° field of view up to 30 feet, alerts your phone the instant movement is detected, distinguishes between human movement and pets, and runs for up to two years on a single battery without a single maintenance visit.

The 100° wide detection field covers the full width of most rooms from a single corner placement — broad enough that a person entering from any direction within range triggers the sensor, narrow enough that the sensor is not constantly scanning surfaces outside the monitored area. At 30 feet of range, one sensor handles an average-sized living room, hallway, or entry point from a single mounting position. For larger spaces, sensors can be placed at opposite corners to achieve overlapping coverage with no dead zones between them.

The adjustable sensitivity is the feature that prevents the most common smart home motion sensor complaint: false alerts. At standard settings, the sensor responds to all motion in range — furniture reflections, air movement, and pets as well as humans. At the human-sensitivity setting, the passive infrared detection threshold is raised to respond primarily to human-sized thermal signatures, filtering out cats, small dogs, and most environmental motion while still catching any person who enters the room. For UAE households with pets, this setting means alerts that are worth checking rather than alerts that train the occupants to ignore them.

Two years of battery life — from a single included CR123A battery — means the sensor operates continuously without calendar reminders to replace batteries. At typical home activity levels of detection events, two years is a realistic expectation. The blue LED activity indicator confirms detection events visually; it can be disabled in the eufy Security app to conserve battery when visual confirmation is not needed.

The sensor connects to eufy Security HomeBase via the eufy Security system's wireless protocol, pairs in seconds via the app, and integrates with the full eufy Security ecosystem — cameras, doorbells, alarms, and other sensors all manageable from the same app interface. Home and Away mode support means alerts can be silenced automatically when occupants are home and activated when the house is empty.

Note: eufy Security HomeBase is required for this sensor to function and is sold separately. This sensor is for indoor use only and is not waterproof.