Protects You, Your Family, and Your Privacy
The Eufy Motion Sensor (model T8910021) is a compact, wireless indoor PIR motion detector designed for the eufy Security ecosystem, requiring a compatible HomeBase (sold separately) to function as part of a home alarm or surveillance setup. It provides reliable motion detection with a wide 100° field of view and up to 30 feet (9 meters) range, covering an entire room effectively for enhanced home security. Key highlights include adjustable sensitivity levels to minimize false alarms from pets or small movements while focusing on human detection, instant app notifications via the eufy Security app when motion is triggered, and an impressive 2-year battery life on a single included battery for low-maintenance, round-the-clock protection. Lightweight (about 2.4 ounces) and easy to install with mounting hardware, it integrates seamlessly with other eufy devices like cameras or sirens (e.g., triggering recordings or the HomeBase’s 100dB alarm), offering privacy-focused local storage and no monthly fees—making it an affordable, dependable addition for monitoring entryways, hallways, living areas, or valuables in your home without constant recharges or subscriptions.
Key Features
Wide-Angle Motion Detection
It offers a 100° field of view and up to 30 feet (9 meters) detection range, allowing a single sensor to effectively cover an entire room, hallway, or entryway and reliably detect human movement while reducing blind spots in typical indoor spaces.
Adjustable Sensitivity Settings
Three customizable sensitivity levels let you fine-tune detection to minimize false alarms from pets, curtains, or small objects while still capturing genuine human motion, providing flexible performance tailored to your home environment and pet situation.
Long 2-Year Battery Life
Powered by a single included CR123A battery, it delivers up to 2 years of reliable operation under normal use, eliminating frequent battery changes and ensuring consistent 24/7 protection with minimal maintenance.
Instant App Notifications
When motion is detected, it sends real-time push notifications to your smartphone via the eufy Security app, allowing immediate awareness of activity whether you’re at home or away, with options to view linked camera footage or trigger automations.
Seamless Eufy Ecosystem Integration
It works exclusively with a compatible eufy HomeBase (required, sold separately) to trigger recordings, activate the HomeBase siren (up to 100dB), or coordinate with other eufy cameras and devices, delivering a unified, privacy-focused security system with local storage and no monthly fees.
What’s in the Box
- Motion Sensor
- User Manual
FAQs
What HomeBase models does it work with?
It is compatible with HomeBase, HomeBase E, HomeBase 2, and HomeBase 3 (and later models that support motion sensors). A HomeBase is required for it to function—no standalone mode.
How do I reduce false alarms from pets or moving objects?
Use the adjustable sensitivity settings in the eufy Security app (Low, Medium, High). Set it to Low or Medium if you have pets or fans/curtains that trigger it often. Position the sensor away from heat sources, vents, or direct sunlight.
How long does the battery really last?
Up to 2 years under typical usage (a few triggers per day). Heavy traffic areas or very high sensitivity can reduce it to 1–1.5 years. Replace with a fresh CR123A lithium battery when the app notifies you of low battery.
Can I use multiple sensors and do they trigger cameras or sirens?
Yes, you can add multiple sensors to one HomeBase. When motion is detected, it can trigger linked eufy cameras to record, send app notifications, sound the HomeBase siren (up to 100 dB), or activate other automations you set up in the app.
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