The app will also alert you when the battery is low Doorbell mode: When at home, activate the doorbell mode as a reminder of visitors Open the Graffiti/Smart Life app to check the opening and door magnet records and keep track of in your home. Alarm mode: When the door is opened abnormally, the door magnet immediately emits an alarm sound of 80dB and sends the information to the mobile phone. You don't need to worry if you forget to close the windows and doors when you go out, you can easily check the status of windows and doors through the Graffiti/Smart Life app interface, so that you can travel without worry. ., Weight: 0.220462262 Pounds, Manufacturer: Faeymth