smart home zigbee window door sensor open/close alarm ewelink hub app real time notification work with alexa google smartthings Description: 1.eWelink Smart ZigBee Door&Window Sensor: A ZigBee Wireless Gateway Hub is a must to work with the door&window sensor. 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.Battery powered for low power consumption; New designed with hall sensing technology and tamper protection; Low battery reminder supported. 4.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 Sensor Wireless Type:Zigbee Battery:CR2032 Operating temperature:-10-50 Operating humidity:0~95% Size:14*31*10mm(Min)25*49*12mm(Max) Package Included: Sensor*1 User Manual*1 Notes: Please be clear before purchase, this product needs to be used with a zigbee3.0 gateway