A motion sensor activates the light when it detects something moving within its field of view. Photocells work with a resistor that changes its conductivity based on how many photons are hitting it.

Ring says its outdoor motion sensor “lets you monitor for motion in areas where you don’t need a light, doorbell, or camera….” That seems like a silly justification at first blush.

The light turns on only when the motion is detected by the PIR motion sensor. The lamp is powered with 3 AAA batteries (in total 4.5 V) and it has a red LED blinking signal to notify about batteries ...

After months of delay, the Xiaomi Smart Ceiling Light D20 is finally available to buy. Its standout feature is a built-in radar sensor that detects motion to automatically turn the light on or off.

Aqara’s Thread-based Motion and Light Sensor P2 ($33.99) has been on my smart home wish list since it was announced way back in 2022 — and now, it’s finally here.

When I was scrolling through my TikTok feed one night, though, I landed on a video praising the user-friendly, easy-to-install EZVALO Rechargeable Motion Sensor Light ($21), available on Amazon.

For Philips Hue systems, the official Hue Motion Sensor ($40 on Amazon) integrates easily with your existing smart-light setup. You can tell it to be active only at certain times, like at night.

Xiaomi Motion Sensor Night Light 2 is a versatile, smart lighting solution that makes your nighttime navigation safe and comfortable. Its innovative features, combined with a user-friendly design ...

It also pairs directly with an IKEA smart bulb. Speaking of light, there's the Vallhorn wireless motion sensor, which activates lights when movement is detected.