Wifi Door Sensor With Alarm Light, Door Alarm 120Db When Opened,, 2 Pack ?Door Sensor that Alerts Your Phone?When door/window is opened , door alarm emits 120dB alarm to deter thieves and flashes red light to attract attention, then sensor will push instant alarm notification to your smartphone. ?Advanced System?The contact sensor comes with a setup button, one button switch mode arm/disarm, 4 volume options. No need for extra remote control, Smart Life APP supports all settings, including volume switching, alarm time setting, on/off button, low battery reminder, timer setting and more smart options. ?Home Smart Linkage? Smart door sensor is programmable with other Tuya Smart Life Devices. To turn on / off your smart home devices automatically by connecting the smart window door sensor with your other smart home devices. For example, your home will be lighted on automatically when you open the door as you get home from work. ?AAA Battery Powered?eMylo window sensors are AAA battery-powered for a long-lasting performance. It is used to detect whether doors, windows, drawers and so on are opened or moved in your absence. When the battery is running out, you will receive an App notification. AAA batteries not included in the box. ?Easy Installation? No tools required. Comes with adhesive tape. Install anywhere using adhesive tape. You can install the door sensor on front doors, garage doors, liquor cabinets, safety deposit box, pet doors and more. Please note that the door magnet is installed at a distance of no more than 0.7cm.