Evolve 20Professional headset with easy call management and great sound for calls and music Easy call management: Get easy access to the most used functions, like 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-canceling microphone eliminates background noise. The ear cushions are designed to reduce high-frequency sounds. You and your conversation partner won’t struggle to hear each other. Plug-and-play setup: The headset works out of the box with all leading systems. Installation is as easy as simply plugging it in.