Jabra Evolve 20 UC USB Professional Wired Stereo Headset with Ultimate Noise Cancellation Mic - BlackEasy call management Get easy access to the most used functions, such as volume and mute. You can also answer and end calls directly from the control unit. Passive Noise Cancellation Simply wear the headset to eliminate high frequency noise, such as human voices all thanks to the specially designed ear cushions. We call this passive noise cancellation. Ultimate noise cancellation microphone State of the art, noise cancelling microphone eliminates