Feature: 1. Home Burglar Alarm: Only supports 2.4G WIFI, the alarm sends you notifications when doors and windows open or close, protecting your home and your family so you can spot intruders in time. 2. Shared Devices: Door window sensor sends you notifications when you are away from home. You can share the device with your family and view the sensor's activity history. 3. Permissions On: When you connect the snesor, please open the permission settings of Bluetooth and for TUYA App on your phone to make sure the permission is on, as well as activate the app geolocation. 4. Wide Application: You can use the door magnet sensor to detect doors, windows, cabinets, drawers or anywhere you want to be notified when it opens or closes. 5. Easy to Install: Install the sensor in just a few steps using double sided tape (included), download for TUYA Smart or for Smart Life app to add the device and detect the status of doors and windows. Specification: Item Type: Door Window Sensor Material: PC Size: Approx. 7x4x3cm/2.76x1.57x1.18in Features: Intrusion AlarmBattery: AAA Battery (not included). Package List: 1 x Alarm1 x Manual1 x Double Faced Adhesive Tape