1. Tuya Smart ZigBee Door&Window Sensor:A Tuya ZigBee Wireless Gateway Hub is a must to work with the door&window sensor,as well as a of ZigBee smart products, which is proved to be and control center for smart homes and plays an irreplaceable role for all ZigBee products and realizes the whole intelligent linkage of your house.Simply add the sensor into the ZigBee 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 from danger with a linkage of the smart door/window sensor,together with zigbee sensor with one zigbee hub required only. Easy to integrate into 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 anywhere you like to protect your house security.Make intelligent linkage with other smart devices to achieve a comprehensive idea of intelligence Battery-powered door sensor: Built-in 1 CR2032 battery (non-rechargeable battery) Working time: 1 year (10 times a day) Standby current: 13uA Working current: 65mA Maximum current: 100 mA Note: The zigbee door and window sensor cannot be used alone, it needs to be equipped with a zigbee 3.0 gateway and cannot be used alone. color:White Material:ABS Package Contents: 2 x smart door sensor 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.