Koss SB45 communication headsets deliver a full range of sound that enables you to not only hear clearly, but also speak clearly. Featuring Koss'' Clear Voice Technology (CVT), the SB45 noise-reduction microphone eliminates excessive background noise. This enables PC voice applications, such as speech recognition, much easier to use. The comfortable design of the Koss SB45 will allow you to comfortably wear these headsets over an extended period. The large, closed ear cups maximize isolation so you can focus on the task or conversation at handThese computer headsets easily fold up for compact storage or transportation. Feel free to fold the SB45 up when you want the comfort and Sound of Koss wherever you have a need for a comfortable conversation.