The Plantronics .Audio 645 USB Behind the Head headset combines rich stereo sound with digitally enhanced voice quality for Skype, Windows Live™, or Yahoo® Messenger Internet calling. Position the boom to talk, or rotate it out of the way when listening to music, Podcasts, or DVDs. A noise-canceling microphone reduces background noise so callers only hear you. A choice of connectivity—analog or USB—makes it easy to plug and play, while the lightweight, behind-the-head headband lets you comfortably use the headset for hours. Adjust music and microphone volume, or mute the microphone, with just a touch while you enjoy consistent, high-quality audio.