The Plantronics DA80 is a high performance USB Audio Processor that allows you to easily switch between your desk phone and soft phone without having to change headsets. The DA80 is equipped with Inline Control - this enables users to answer, end, mute and control the volume of calls without changing the settings on the computer. Other features include built in DSP technology, superior noise and echo cancellation and the DA80 meets OSHA and Noise At Work regulations. Simply connect your Plantronics headset the QD connection point and you re ready to go!