... Auto DialingThis alarm system supports most of the wireless detectors, such as PIR sensor, magnetic gap detector, infrared balusters, smoking and gas ... or your friend when triggered* Alarm with auto dialing function, work based on GSM network ... calling and 3 groups for SMS message* Support 4 wired zones, 6 wireless zones, ... hear the alert message when receive the auto call from the system* 4 different arm ...