1.Functional wifi Smart Human Presence Sensor: Featured as human presence,human static,human Mini motion and human movement to detect the presence or absence of people in the area,even to detect the static state such as personnel sleeping accurately with mmWave Radar Detection featured. 2. Perceived Light Intensity for Smart&Scene Linkage: Illuminance monitor in Tuya Smart APP enables smart feature as smart scene linkage with other smart devices,especially your lights to ON/OFF automatically as the brightness changes;Besides,you can intelligently linkage the sensor to other devices automation. 3.The ceiling mount can be installed like a downlight, which can be directly by AC; the wall mount can be attached to the wall or wherever you need it. It's as light as a wireless hub, and it's by USB 5V. 4. Advanced New Design with Multiple Settings: Set the sensitivity from 1-9 to your own need, with minimum detect range as 0.00m and maximum as 9.5m for flexible detection demand.Meanwhile,it is designed with hold time set as 0-1500s and detection latency set as 0-10s to avoid irrelevant annoying movement and reduce alarm rate. Network: Wifi. Celling mount sensor input: 80-240VAC. Wall mount sensor input: USB 5V. Working temperature: -20~+70 Sensitivity: 1-9(default 7) Wall mount sensor sensing distance: 0.3-9m(Default 6m). Celling mount sensor sensing radius: 0-7m(Default 5m). Illuminance Sensor: 0-2000 . detection confirmation time:0-10s disappearance delay time:2-1500s. Celling Mount Size: :61 x H39 mm Celling Mount Opening Size: 53-58mm Wall Mount Size: 58mm x 58mm x 11mm Colour:White Material:plastic Contents: 1 x Human Presence Motion Sensor Only the above content, other are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.