Galaxy Audio AS-HSU3BK Uni-Directional Headset MicThe Galaxy Audio AS HS uni directional headset comes standard with the ECM, PSE, TRC, DHT, DHX, 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. Uni directional headset microphone Hooks