LCD GSM Security Alarm System 1.Two-way communication 2.SMS ... LCD GSM Security System(LS-GSM-101) 8 wireless defence zones,each zone can add 10pcs wireless detectors, this system can add ... ), Disarmed, SOS are available;4) Armed delay, alarm delay, siren work or not, more other functions ... -detect and report, GSM Signal Jammer alarm, SMS Switch is available.8) User friendly Icons for LED indicators, ...