easy installation Supports connection to WiFi Detects if there are people in the area Can be connected to a cell phone You can set up linkage control of , switches, air-conditioners, curtains and other devices through Graffiti APP. Graffiti Intelligent Solution Human Presence Sensor Suitable for Graffiti APP or Smart Life APP Built-in radar sensor chip can detect whether there is someone in the room in real time, and set up linkage control of , switches, air conditioners, curtains and other devices through Graffiti APP. Set up mobile APP push alarm or phone / SMS alarm. Function: real-time detection of human presence status (occupied - red light, unoccupied - green light) indicator light switch through APP Sensitivity and detection distance adjustable Power supply:no built-in battery, need USB cable for real-time power supply Colour:Black Material:Plastic Size:10x10x4cm Package Contents: 1 * sensor 1 * usb power cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.