HS10 Fire Safety Over the Head OTH Headset with Mic On Off Switch is a 2-way communication headset, built specifically for industrial, safety, and civil service jobs. This Carbon Fiber model features a pigtail style 5 pin port and Yellow PTT (Push-to-Talk) button on eardome. The headset has features like a DNC microphone for clear transmissions, Clear Hear speakers for unsurpassed audio performance and a robust full flex mic boom. Other highlights include a Stainless Steel over the head band and noise cancelling EM56 hybrid microphone. It is recommended to use with Coil Cord #CC-1/4 fitting with 1/4in stereo jack intercoms.