1) It is used to probe whether door, window and drawer is illegally open or not.
2) It consists of the wireless alarm host and magnetic iron fixed box. Once the battery is put in, it will work. When it probes that the moving distance (opening door) is more than 30mm, the indicator light (red) will turn on, and the signal will be sent to the host. The host (if being in the arming condition) will alarm the intruder by ringing the present siren, and automatically dial phone number preset at the same time.
3) It can install the Alarm System of different types.
4) Battery: 12V 23A