FHS Over-The-Head Fire Safety Industrial Headset is a universal design by Rugged Radios that can operate with almost any brand or type of fire intercom. The headset is reversible, now allowing for left or right cord connection. Available in three configurations: No buttons, PTT (Push To Talk) button and Mic On/Off button. It features a DNC microphone and Clear Hear speakers for superb audio performance. This Over-The-Head design provides comfort, notably including waterproof cover on ear dome, noise-cancelling hybrid EM56 microphone, stainless steel band, all-day comfort head pad, full flex mic, large detent volume control, carbon fiber style finish. Compatible with David Clark, Avcomm, Sigtronics, Rugged, and Firecom.