Features: 1) Detector and host machine are connected through automatic corresponding coding, so expansion is simpler 2) Defense arrange and defense withdrawal made via telephone remote control, site monitoring, start alarm whistle and other functions 3) Power interruption protection function in the system's settings 4) Work status indication (defense arrangement, defense withdrawal, power source, low voltage, alarm) 5) 20s alarm address audio recording 6) System setting amendment shall be made with remote controller, with high safety 7) Built-in standby battery, ensuring normal operation of system if power is interrupted 8) Can externally connect to a 110dB alarm 9) 6-defence area display function 10) Several defense arrangement modes: defense arrangement, sub-area defense arrangement, soundless defense arrangement 11) 6-group alarm telephone number 12) 6 wireless defense areas 13) Urgent alarm function 14) Anti-cutting breakage alarm function 15) Computerized alarm receiving and networking function