Wireless GSM Alarm System: 16 wireless ,3 wired zone 5 groups of user telephone 1 group of center of alarm backup batter Wireless GSM Alarm System: ... scene personnel. 9, Lead plane interruption of power supply hint function (when the inner has reserving battery): ... : GSM network alarm, SMS alarm. 5, stored telephone numbers: 5 groups, telephone number bit longer: 32. 6, operating frequency: 315MHz ...