1、Real Time Alarm: When door window is opened or closed, the sensor will push instant notification to your mobile phone immediately. 2、Function: Contact sensor can sense door, window, electrical appliances and furniture cabinet doors, drawers and other objects open or close. 3、High Quality Material: Door sensor is made of high quality ABS material, wear resistant, high strength, sturdy and durable. 4、Simple Installation: The installation is simple, no complicated operation and toll is required, convenient for using, save your time and energy. 5、Wide Application: Door open contact sensor is ideal for homes, apartments, offices, hotel rooms, garages, and more, have a wide range of application. Item Type: Door Window Sensor Material: ABSColor: White Communication Mode: For zigbee Function: Sense door, wndow, electrical appliances and furniture cabinet doors, drawers and other objects open/close Battery Type: Built-in 60mAh CR2032 battery 1 x Door Window Sensor 1 x Secondary Sensor 1 x Sticker 1 x Reset Pin 1 x User Manual