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<br />tone and the SCBA indicator lights shall flash "red". During normal operation, the SCBA <br />indicator lights shall flash "green". At half and quarter cylinder, the sounders shall "chirp" and the <br />SCBA indicator lights shall flash "tri-color". <br /> <br />Voice Amplifier Communication System <br /> <br />Each facepiece shall have a voice amplifier powered by a single 9 volt battery. The amplifier <br />should be lightweight, no more than 6 oz including battery and provide up to 20 hours of service <br />from a single battery. Amplifier shall have a simple 1/4 turn universal mounting bracket. <br />