Versatile Sensor Inside Your Home - The door window sensor will be triggered when the door or window is opened or closed, you will receive an instant notification and alarm on your phone within about 2-8 seconds depending on the Wi-Fi networks. NOTE: Only supports 2.4GHz. The push notifications function can be turned off on the app when you are at home and the wifi door sensor will continue to record the history so you can check it whenever you need. Gives you complete peace of mind. EASY INSTALLATION - With tape and screws, all the items you need to get started are in the box. You can use double-sided tape or screws to attach the sensors to door and window frames. Please make sure the sensor is aligned with the magnet and the gap is less than 10mm. ALEXA & GOOGLE HOME COMPATIBLE - By asking Alexa or Google home, you can easily know the status of the doors. Mount on front doors, back doors, garage doors, windows, cabinets, drawers or anywhere you want to know if they are open. Quantity: 1 Smart Style You can realize the function of turning on the light on auto when you come home by creating a smart scene on APP and you can DIY different scenes by adding a condition and a task. Example, add a condition "when the door sensor is open", add a task " No wiring required With 2 pre-installed batteries with a pull tab, simply remove the tab to get ready to work. 2 ways to install Use double-sided glue or a screw to install. Simply stick or screw the sensor to your door window frame. Low battery consumption Battery life on standard use, up to 16 months depending on usage, temperature, and other factors. The APP will tell you the battery level.