Uni-directional headset comes standard with the ECM, PSE, TRC, DHT, CTS, and 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.