... phone numbers telephone alarm system,wireless alarm,home alarm,wireless alarm,home alarm system,mms home alarm,home security,wireless home alarm,burglar alarmDescription ... AC110~220V, 50 or 60Hz, DC9V to 12VWorking hours of backup battery(DC7.2V): More than 6 hours.Working current:I1 ... 5kgsSize: 445(L)*305 x 290 (H)mm Telephone alarm system with 8 wireless guarding zones and 4 hardwire guarding zones