... /1900MHz (optional) 10 Hours GSM Alarm,wireless alarm,home alarm,GSM home alarm,wireless alarm,home alarm systemDescription and Main functionsThe alarm system is based on GSM network. With ... , 4000mA optionalStandby battery working hours: more than 10 hours, 4000mA for over 3 daysRelay contact output 1 & 2: 7A, 240VAC; 10A ...