The Xiaomi Motion Sensor 2S is a device that detects human movement and ambient light illumination. When someone moves into the detection area or the ambient light illumination changes significantly, the sensor will send a notification to the Mi Home/Xiaomi Home APP through a nearby Bluetooth gateway. The Xiaomi Motion Sensor 2S needs to connect to the Bluetooth Mesh gateway to experience full software functions. You need to accomplish several smart scenes with other Xiaomi smart devices through wireless control. The product overview of the Xiaomi Motion Sensor 2S is listed below: There is a Lens, Reset Button, Battery Cover Lock, Stand Battery Cover and Base. The standard packaging contents of the Xiaomi Motion Sensor 2S include a Xiaomi Motion Sensor 2S and a user manual.