The Sound-Light Fire Alarm apparatus are one kind terminal device for alarm, it is fit for the sound & light alarm when the fire happens.Selects two or the four-wire system wiring method, the main line end receives two main lines, not polarization, power source termination to DC12V power line.At first , get into two hole well in the install place (wall ), the hole distance is 65MM, installs the plastics and swells stopper (if the wall is the wooden material , can be by attacking the screw and fastening by oneself directly);Connect DC12V power and network link, and set up a kind of alarm sound well according to the need;Specialize in screw by oneself with two, fix the alarm to install in the place, tighten the screw alarm.