Main Features:  1. Tuya Smart ZB Door&Window Sensor: A Tuya ZB Wireless Gateway Hub is a must to work with the door&window sensor,as well as a variety of ZB smart products, which is proved to be the bridge and control center for smart homes and plays an irreplaceable role for ZigBee products and realizes the whole intelligent linkage of your house.Simply add the sensor into the ZB hub after adding the hub into Smart Life/Tuya App.  2. Real-time remote monitoring: Whenever and wherever you are,once Door/Window Sensor detects external objects or animals, you will receive a notification by smart phone. Keep your house safe all the time.What you need to do is to keep your sensor with ZigBee hub connected.  3. Wide Applications: Apply the smart door/window sensor to different scenes,your bedroom,garage,bathroom,garden and anywhere you like,keeping your whole house away from danger with a linkage of the smart door/window sensor,together with various ZB sensor with one ZB hub required only. Easy to integrate into various environments.  4. Battery powered for low power consumption: New designed with hall sensing technology and tamper protection;Low battery reminder supported.  5. Easy installation with double-side tape: simply stick it anywhere you like to protect your house security.Make intelligent linkage with other smart devices to achieve a comprehensive idea of intelligence;includes full 2-year warranty and 60-day refund guarantee for complete satisfaction.    Specifications:  Wireless Technology: ZB;  Working Voltage: 2.4V-3.3V(CR2032 battery);  Transmission Frequency: 2.4GHz;  Working Temperature: ‒20°C ~+60°C, 0%~95%RH;  Transmission Range :Indoor:10~30m/Outdoor:30~50m;  Size Main Body:40*25*12mm;  Size Small Body:25*10*9mm;    Package included:   1 x Sensor;  1 x User Manual