... phone and send SMS with alarm system wireless/wired gsm intruder alarm1, wireless/wired gsm intruder alarm2, backup battery for home alarm3 ... alarm systemFeatures: 1, GSM network, no need telephone line2, 16 wireless zone and 4 wired zone for gsm intruder alarm3, can call ... The home wireless gsm security system inner PCB board: wireless/wired gsm intruder alarm