FHS Behind-The-Head Fire Safety Industrial Headset by Rugged Radios is a universal, comfortable headset, compatible with almost any brand of fire intercom. Unique features include dual 5-pin quick-disconnect for easy use, a DNC microphone for clear transmissions, Clear Hear speakers for excellent audio performance and specialized technology for durability. Configurations come with No buttons PTT, PTT button on ear dome and Mic On/Off button on ear dome. Other attributes include adjustable band, noise canceling hybrid EM56 microphone, Rugged full flex mic boom, large volume control and carbon fiber style finish. Cable compatibility includes David Clark, Avcomm, Sigtronics, Rugged and Firecom.