... -240V 5.433mhz, 315mhz Functions & Features of the GSM Alarm System :1.Touch keypad; Big LCD displays, NO EXTERNAL GSM ANTENNA ... History4.30 wireless zones + 8 wired zones, every zone attribute, name, bypass, alarm delay, intelligent door sensor function, beep indication could ... setting.5.Preset 5 phone/SMS alarm number in the system, 1 extra phone alarm number for CID CMS, 1 extra ...