The Jabra Evolve 20 MS Mono is a professional headset specifically designed to improve conversations. Its state-of-the-art noise-canceling microphone eliminates noise so you can hear more and be better focused on the conversation. Key Features: Effectively cancels outside noise to eliminate distortion with maximum sound efficiency. Noise cancellation enables you to enjoy an exceptional audio experience with maximum usability and reliance. Noise Cancelling microphone technology ensures easy convenient talking with maximum efficiency. Call Control earpiece control for optimal performance and maximum reliability. The 20 headset provides plenty of freedom with wired connectivity. Over-the-head earpiece design provides a comfortable and secure fit. These supra-aural EVOLVE give you the comfort of portability. Features USB connector. Boom mic lets you chat with your friends and family on Skype and on multiplayer network games. Great for Audio/Visual Labs, Assisted Listening Systems, and more that have a Mono jack for non-stereo use.