AUDIO645USB - Plantronics .Audio 645 USB Stereo Headset Behind-the-neck combines rich stereo sound with digitally enhanced voice quality for Skype, Windows Live, or Yahoo Messenger Internet A choice of connectivity, analog or USB makes it easy to plug-and-play Consistent, high-quality audio for Internet calling, playing games or relaxing with music Noise canceling boom microphone for clearer conversations Adjustable boom for precise positioning of the microphone