... zones 2.Suitable for home, office, shop 3.Quad band GSM frequency 4.Voltage: 110V-240V 5.433mhz, ... 315mhz Functions & Features of the GSM Alarm System :1.Touch keypad; Big LCD displays, NO EXTERNAL ... .5.Preset 5 phone/SMS alarm number in the system, 1 extra phone alarm number for CID CMS, ... around 24 hours, Full charging time: 8hours 4.4-Band : 850/900/1800/1900Mhz5. GSM transmit power: 2W 6 ...