... alarm system adopts SMS data transmission and voice platform of GSM network to send control command and receive alarm remotely. The system ... GSM module. * 9 wireless guarding zones( 1 SOS alarm zone, 1 fire alarm zone, 1 external power failure alarm zone, the other ... system status, while its power is off. * Connect with the alarm center through GSM network. Specification * Zone 2 hardwire, 8 wireless ...