Double network GSM alarm Use condition, one is independently, there is no telephone line,only SIM card; another is to connect to use with the telephone When there is no telephone wire or wrong with the telephone, it can alarm through GSM with cell phone card . Against the same frequence to disturb, and the wireless discode. Have 99 defence zone, can set 8 the defence zones Can programme to mention the defence zone. Under the condition of disalarm, the buzzer makes signals once the detector triggered in this defence zone. Can be compatible to any detectors(resistance with 4.7M). Can record the message, and the message won't lose when no electricity. When being triggered, the alarming message still can be heard through the phone. Long distance to monitor the spot condition, also to alarm and disalarm. To make the code in study way. When there is no electricity in the outer adaptor, the inner electricity can continue to work, and charge up once having electricity. With the function to against thunder. REMARK a, Power adapter: Input AC220V; 230-240V; 110V; Output DC 9V, 300mA b, Wireless frequency format 900/1800 MHz supported, also with 315MHz/433MHz c, CE/UL certificates