Alarm mode: when the door is opened abnormally, the door magnet immediately emits 80dB alarm sound and pushes the information to the cell phone. Doorbell mode: when you are , turn on the doorbell mode as a reminder of visitors Open Graffiti/Smart Life APP to check the opening and closing records of the door magnet, and keep track of everything in your home. The app also alert you when the battery is low No need to worry about whether you forget to close the and doors when you go out, you can easily check the status of and doors through the interface of Graffiti/Smart Life APP, so that you can travel without worry. Descriptions: Principle of operation open/close prompt: when someone opens the door or window (door magnet host and magnetic stripe separation) immediately sends out an alarm sound and pushes the SMS to the cell phone to prompt the door to be opened/closed Doorbell mode: when you are , turn on the doorbell mode as a reminder of visitors, when you go out, set the alarm mode