Notes:Please be clear before purchase, this product needs to be used with a zigbee3.0 gatewayEWelinkZigBeeSmart Door & Window SensorDescription:1.eWelink Smart ZigBee Door&Window Sensor:A ZigBee Wireless Gateway Hub is a must to work with the door&window sensor,as well as a variety of ZigBee smart products, which is proved to be the bridge and control center for smart homes and plays an irreplaceable role for all ZigBee products and realizes the whole intelligent linkage of your house.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 zigbee sensor with one zigbee 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 Specifications:Product Name:Door SensorWireless Type:ZigbeeBattery:CR2032Operating temperature:-10-50Operating humidity:0~95%Size:14*31*10mm(Min)25*49*12mm(Max)Package Included:Sensor*1User Manual*1EWelinkZigBeeSmart Temperature and Humidity Sensor Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin