... Security Alarm System 1.Two-way communication 2.SMS arm/disarm 3.Can add 80pcs sensors 4.CE/ROHS certification Wireless zones LCD GSM Security System ... (LS-GSM-101) 8 wireless defence zones,each zone can add 10pcs wireless detectors, this system can ... ), Disarmed, SOS are available;4) Armed delay, alarm delay, siren work or not, more other functions ...