... cell phones, no need the fixed telephone line.Can set HOME arm/AWAY armWhen alarming, system plays the recorded voice at ... can work about 24 hours.Has output relay, can control home appliance,such as light, cooker, air-conditioner and so on.Basic ... , security system , zone alarm, home burglar alarm, house alarm system, gsm home alarm, gsm wireless alarm, auto alarm, home security, GPS tracking system ...