... ,gsm security alarm system,gsm intelligent alarm systemFeatures: 1. Touch keypad: Bule back-up light; LCD display date, day of the ... 2/4 Band Net transmission, phone audible alarming and SMS alarming; 3. 15 wireless zones. Support 2 more wired zones(Optional);4 ... ;7. Arm/Disarm the system by 5ways: SMS, Main Host(Keypad), Wirless keypad, keychian remotes, or even remotely by phones. (PSTN alarm ...