The ECM-322BC electret condenser headset mic is ideal for use in a variety of multimedia presentation applications, ranging from seminars and conferences to lectures and workshops. The ECM-322BC incorporates an omni-directional microphone capsule providing highly sensitive and clear sound pick-up. It's lightweight and ergonomic design provides a tight and secure, yet extremely comfortable fit that can be worn on the right or left ear. This headset is equipped with a slim and flexible boom, so the microphone position can easily be adjusted for optimum voice pick up. The BC model contains a (SMC9-4P) Sony 4-pin connector for use with Sony WL-800 Series wireless bodypack transmitters.