GSM Alarm System: 1. Host one (including antenna) 2. Wireless door (window) a magnetic detector 3. 2 remote controls. Features1, ... : Alarm may duplex intercom for field personnel.4, 16 wireless zones, 5-way wired zones can be set to the surrounding zone ... -hour zone, sound alarm, silent alarm types for different occasions.5, cable zone (normally open, normally closed two types) are free ...