Passive noise cancellation for ideal concentration: Keeps high-frequency noise such as human voices out for better work collaboration and listening experience in any environment Easy call management: External sound controller allows for making, taking and muting calls – Stay connected and available at all times This Evolve 20 MC headset is optimised for all major unified communication platforms and built for style and comfort with soft foam ear cushions – Adjustable headband lets you find the perfect fit Plug-and-play setup: The headset works out of the box with all leading systems – Installation is as easy as simply plugging it in Scope of delivery: Jabra Evolve 20 MC Mono on-ear headset, USB C/A with control unit – Colour: black