1、When the door/window is opened or closed, it will immediately push an instant notification to your phone. 2、Provides 24‑hour monitoring, allowing you to use the app to check whether the door/window is open anytime, anywhere. 3、When someone opens or closes your door or window, a loud alarm is triggered, make you informed all the time. 4、Support to check open / close records in the app. The application can display the status of all doors and window detected by multiple door sensors at different locations at the same time. 5、When the battery power is low, it will automatically remind you to replace the battery, never worry about running out of battery. 6、Share the added door sensors with your family member, they also can monitor the status of your doors/windows when you are outside. 2 x WiFi Door Sensor Item Type: WiFi Door Sensor Material: ABSBattery: 1 x CR2 3V (include)Standby Current: ≤5uAProtocol: IEEE 802.11b/g/nWireless Range: Approx. 50m/164ftWorking Temperature: -10℃-40℃ (14℉-104℉)Working Humidity: 20%-85%Storage Temperature: -10℃-60℃ (14℉-140℉)Storage Humidity: 0%-90%Wireless Type: 2.4GHzStandby Time: 4-6 months