... C.Support battery protect functionD.Support memory function1. Instruction of wireless burglar home alarm The alarm system adopts SMS data transmission ... frequency GSM module.3.9 guarding zones 1 wireless SOS alarm zone, 1 wireless fire alarm zone, 1 external power failure ... alarm center through GSM network.3. Technical parameters of gsm wireless home alarm a) GSM network frequency: 850/1900MHZ or 900 ...