This uni-directional headset comes standard with the ECM, PSE, TRC, DHT, CTS, & Traveler Headset Systems. It's comfortable wrap around design goes over both ears and helps ensure that this mic will stay in place. The HS-U3BK can be wired to work with transmitters made by Galaxy Audio®, Shure®, Sennheiser®, AKG®, and Audio Technica®, as well as most other brands of wireless microphone systems.