Professional-grade single-ear intercom headset from Clear-Com, the industry standard for live broadcast, theater, houses of worship, sports production, and corporate AV. This is the CC-110-[X4] variant with a [4-pin female XLR] connector — compatible with Clear-Com Encore (RS-501/RS-701), FreeSpeak, HelixNet beltpacks, and any system using a matching pinout.