Koss SB45 USB Full Size Communication Headsets deliver the full range Sound of Koss allowing you to hear and speak clearly. The Koss Clear Voice Technology, or CVT, allows the SB45 USB noise-reduction microphone to eliminate excessive background noise. This enables the PC voice applications, such as speech recognition, to be used much more easily. The SB45 USB effortlessly collapses into a compact form for easy storage or on-the-go transportation. Just simply collapse the SB45 USB into its compact form for when you want the comfortable Sound of Koss wherever you are.