This alarm system contains a main set with remote controllers and 2 detectors: door entry detector, infrared detector.You can set the main set two modes: on guard/ withdraw guard by keypad on the main set or by remote controller. Being in the mode of on guard, if some detector emits signal, the main set will alarm at once or delayed to a pre-set period of time. when emergency event happens, the main set receives a trigger signal from the panic key of remote controller, the system's siren will give out loud sound as well as dial out 6 groups of pre-stored telephone numbers. what is more, the system can be operated by telephone far or near as well as report alarm messages to an administration computer immediately via the public telephone network.......