The GSM Alarm System S120 supports two-way communication, 20 wired zones, 16 wireless zones, 5 remote controls, 2 output relays and 1 watchdog zone, 3 24Hours zone, and 1 SOS zones. User freindly design! It is special for factory, office applications. >>>>>Why King Pigeon S120? 1.Two-way Voice communication or wiretap are available; 2.LCD displays the entire setup menu; 3.Armed, Partial Armed(At House or Stay), Disarmed, SOS are available; 4.Armed delay, alarm delay,[...]