The system makes use of communication equipment to realize multi-channel detection, scene alarm, emergency alarm, fire alarm and toxic gas leakage automatic alarm. It realizes remote voice alarm function through the automatic
dial-up telephone[2]. It directly parallels on the telephone lines, then may be used. Before used, user will be required to install the detection device in place where being watched by people. It must be set up alarm telephone number, recorded voice alarm. The alarm system has design innovation, multiply function, low cost, high reliability and so on.