1.It utilized DTMF network, the alarm information can be sent to the normal phone, or to the alarm management center, to realize the telephone online alarm function. 2. It has 4-zone wired armed areas, and each of the armed area has DC12V power to support the detectors and also it provides the short circuit protect function and alarm function. 3. It provides 4-zone wireless armed areas, and the wireless detectors can be used after being registered. 4. Each armed area could be armed or disarmed by the user easily, and the arm/disarm function could be banned or opened by the user as and when necessary. 5. The time-delay of arm or disarm (0-90 seconds) can be configure by user. 6. It can register up to 8 wireless remote control, and use the remote control to arm/disarm or make emergency help call. 7. It has a high DB alarm horn, to make the site alarm, and the alarm horn function can be open or banned freely by the user in each armed area. 8. It could preset and store 6 telephone numbers (one for the management center and the others are including pager number, mobile phone number, or the telephone number). 9. It has a system diagnose function, to detect and give a prompt reminding when there are failures or emergencies. 10. The system provide a protection function when there is a breakdown of the line, a short circuit or a low-voltage of the battery, and it also has a disassemble-proof alarm function. 11. The alarm host machine could save eight pieces of the up to date alarm information. 12. It has the system initialize function, and will make the system return to the default state when needed.