Receive Real-time Alarms Remotely: when the door/window is opened or closed, the sensor will push instant notification to your smartphone immediately Alert message push: When the door/window is triggered, you will receive an alarm signal from your phone. Convenient for you to detect your doors, windows, cabinets, drawers, or anywhere you want to notified when it is opened or closed. Only work with 2.4 GHz WIFI CONNECTION: It connects to your smartphone via App under 2.4G Wi-Fi environment. If your WiFi router only supports 5G, the device won't connect. Compatible with for Alexa and Google home: It can also perform auto control together with other smart devices that are compatible with Smart life. The sensor door needs two AAA batteries(not include). When the battery level is low, it will automatically push messages through APP to remind you to change the battery, never worry about running out of battery. Easy Installation: No Need to use complicated tools when installation, just use glue to install, firm and durable. The distance between the two components should be as close as possible, and the closest distance should not affect the opening/closing of the door or window. Power Supply:2 x AAA battery (Not included batteries) Color:White Material:ABS Package Contents: 2 * door sensors