Amazon Echo’s built-in ultrasonic motion sensing can let you easily automate lights and fans with Alexa routines, without buying anything else.

A new technology that turns Zigbee-powered smart plugs, switches, and bulbs into motion sensors could be deployed to millions of devices with an OTA update.

During the nighttime, the light turns on automatically if it senses motion, and it turns off automatically if there is no motion after 20 seconds.

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.