... 1. wireless gsm security alarm system 2. 8 wireless defense zones 3. every zone could connect with 10 sensors 4. LCD display Wireless GSM Security Alarm SystemsFunction ... 12) Users can make calls by using keypad on alarm panel, just like a telephone;13) One-key-control function: Out Arm, Home ... Arm, Remote Arm;14) SOS, fire, gas, door, hall, window, balcony, and perimeter places alarm;15) ...