Quadband GSM module,widely used all over world. 6 wireless and 4 wired defense zones. 2 groups of timely arm/disarm. 6 groups phone numbers,3 groups SMS phone numbers. Voice prompt operation with 10 seconds auto voice recording. Remote control via call/send SMS,realize Arm/Disarm/listen-in/two-way speak etc. 1group NC/NO output,can control home appliance. Can learn 50 remote control & 50 detectors. Built-in rechargeable batter y,power cut-off send SMS alert.