... SYSTEM alam system security alarm, Home burglar alarm GSM POWER FACILITY ALARM SYSTEM, Dual Band:GSM850/1900MHZGSM ALARM ... thunder12. The system has power-off protection function. When the external power supply is damaged or the power is off, the system ... center(such as the police station) through GSM network, Dual Band:GSM900/1800MHZ GSM POWER FACILITY ALARM SYSTEM, Dual Band:GSM850/1900MHZ