1. This alarm is to install a sensor on the window or door. If you open the door or window, it will trigger the alarm, send a loud alarm, and send a text message through the app to inform you. If you put the SIM card in the alert, it will call you the voice call. 2. If the PIR movement sensor is installed in the need, it is the infrared sensor of the human body. When someone approaches, it will send a warning voice, and it will also send a text message and call you. 3. If you install smoke detectors, carbon monitor detectors, and gas detectors, you will also notify you when fire and gas leakage. 4. It has a lot of You can set it to the mute mode when you go home, the alarm protection mode when you go out, and so on. 5. You can also open the protection mode and revoke the protection mode remotely through the mobile app.