... 8 wireless zones receiving frequency: 315MHZ/433MHZ frequency: 900/1800MHz & 850/1900MHz (optional) 10 Hours GSM Alarm,wireless alarm,home alarm ... alarm host (315M/433M optional ).* GSM GSM frequency: 900/1800MHz & 850/ 1900MHz (optional) The GSM frequency of model no.G10E: 900 ... /1800MHZ The GSM frequency of model no.G10EA: 850/1900MHZ* LED Eight controller works LED* External power failure ...