FHS Behind-The-Head Fire Safety Industrial Headset, by Rugged Radios, features a universal design that works with almost any brand or type of fire intercom using optional coil-cords. The headset has a dual 5-pin quick-disconnect feature for right or left dress for preferred side body placement. It's available in three configurations: No buttons, PTT (Push To Talk) button on ear dome and Mic On/Off button. Key features include DNC microphone for clear transmissions, Clear Hear speakers for unsurpassed audio performance and Behind-The-Head design for comfort. Other specifications include noise cancelling hybrid EM56 microphone, rugged full flex mic boom, large detent volume control and carbon fiber style finish. Sets are compatible with David Clark, Avcomm, Sigtronics, Rugged and Firecom headsets.