GSM alarm system with MMS Features: 1) One independent unit, there is no telephone line, only SIM card; another unit is to connect to use with the telephone 2) When there is no telephone line or wrong telephone line, it can set off alarm through GSM network with SIM card 3) Protection against disturbance from same frequencies and the wireless hacking 4) Has 99 defense zones, can set 8 the defense zones at one time 5) Can program the defense zone; when triggered alarm is set off 6) Compatible with any detectors (resistance within 4.7m) 7) Can record message, the message won't be lost when no there's no power. When triggered, the alarm message is still can be heard through the phone 8) Long distance monitoring spot conditions, also arm and disarm functions 9) When there is no power in the external adapter, the built-in power will continue to work the unit and recharge once there is power 10) Thunder protection Specifications: 1) Power adapter: a) Input AC 220V; 230 - 240V; 110V b) Output DC 9V, 300mA 2) Wireless frequency format: 850/900 / 1800/1900MHz; 315MHz / 433MHz 3) CE and FCC certified