- Working with 2.4GHz WiFi only, When a door or window is opened, it starts to make a sound and flashes a red light to notify you that something has happened, you can get the status of the sensor on the Tuya/Smart Life APP, so you know someone has entered or left your home - The door sensor provides you with 7*24 hours of comprehensive monitoring. It is suitable for installation at doors, windows, garages, drawers, shops and can obtain opening or closing information to your mobile phone, aslo have status records for you to check and provide protection where you need it - The Door Window Sensor takes 2* AAA batteries, easy to buy and the smaller unit is just a magnet, so doesn't need any. When the sensor is low on battery, the indicator light will flash once a minute and give you a low battery notification indicating that the battery needs to be replaced as soon as possible - Double click the button within 0.5 seconds to adjust the alarm volume, cycling between HIGH MEDIUM LOW and MUTE with the default volume being HIGH. When the sensor is set to non-mute mode, with the door/window open, it will emit a continuous beeping alarm and the indicator light will flash red rapidly, and flashes only in mute mode - Business and home window and door alarms can be easily installed in your home store and garage doors and windows. You can remove the double-sided tape on the back and attach the system to the door or window you wants to monitor, making sure the sensor and magnet lines up, We suggested that the installation distance of the two parts should be within 1cm so that the sensor can mutual received signals