•More safety and guarantee with defense arrangement and defense removal controlled by a remote controller; •More accurate alarm with a telephone monitoring the alarming site; •Support for multi-level defense, convenience and practicability; •More individualization with automatically recorded alarm speech,; •Remote control with a main machine remotely controlled by a telephone; •Steady operation of the system with automatic switchover between An AC power supply and a DC power supply. Specifications: 1.Operating Voltage: AC 110V±10V 60Hz or 220V V±10V 50Hz /DC 12±3V; 2.Quiescent Current: ≤10mA; 3.Nominal Power: 12W; 4.Reception Frequency Range: 315±10﹪MHz～433±10﹪MHz; 5.Operational Environment: temperature: -10℃～＋40℃，relative humidity＜95﹪; 6.The number of telephone numbers stored in the memory: 5; 7.The frequency of alarm dialing: dialing each telephone number for 3 times circularly; 8.Backup Power: 8 rechargeable batteries with AA 1.2V 1800mAh.