The Jabra Evolve 20 UC Mono is a professional headset specifically designed to improve conversations. The headset features Premium noise cancellation technology which enhances call clarity by eliminating background noise.The speakers are built for style and comfort with soft ear cushions which is designed to last and reduce office noise. The Evolve 20 UC Mono comes with a control unit which supports comfortable and easy access to most used functions such as volume and mute. It is optimized for Unified Communication providing instant ?Plug & Play? installation for your headset. . . Evolve 20 UC Mono: . . |Mono Headset Made For Voice & Music |Optimized for Unified Communication w/ USB Adapter |Passive Noise Canceling Speakers w/ Foam Cushions |Noise Canceling Microphone |In-Line Call Controls w/ Mute |Jabra Xpress Compatible |Connects to PC Via USB |Fully Adjustable |Over-The-Head Wearing Style |Certified by Cisco & Avaya |Compatible w/ Leading UC Providers . .