General: Audio Visual Alarms are manufactured as per requirements of DGMS, A govt of India Organisation circular No. 7 of 1977 which stipulates that an audio visual warning device should be provided on the rear side of HEMM of tippers to warn the persons that the vehicle is being reversed and that the sound of the device should be different than conventional horns. Design: In order to comply with the requirements of the circular, the design comprises of an electronic device which produces sound of variable pitch and a visual device which generates flashes at 60 to 80 / minute. The audio output is 10 / 15 watt and visual output is designed according to requirement i. E. 21 watts or 60 watts. Decibel Level: Alarms are tested for minimum decibel level of 100. It is possible that some Alarms have decibel level of more that 100 because of impedance of the speaker which the company procures from other manufacturers. Construction: IEPL offers 4 models which are 24v with 21 and 60 watt flasher