Discontinued.  Replaced by Plantronics .Audio 645 Behind-The-Head USB Stereo Headset.

Plantronics .Audio 345 headset combines comfort and rich stereo sound with digitally-enhanced voice quality for Skype, Windows Live, or Yahoo Internet calling, making it the natural choice to enjoy consistent, high-quality audio. Position the boom to talk or rotate it out of the way when listening to music, Podcasts, or DVDs. Internet calls sound better and games are more realistic with full-range stereo. A noise-canceling microphone reduces background noise so callers only hear you. The lightweight, behind-the-head headband delivers complete comfort for hours and convenient in-line controls let you adjust music and microphone volume or mute the microphone with just a touch.

Key Features:

Lightweight and flexible, the headband is worn comfortably behind your head.
Watch a video or listen to music and Podcasts in full-range stereo.
Rotate the boom to talk, or stow it out of the way when listening to music, Podcasts, or DVDs.
A noise-canceling microphone reduces background noise.
Convenient in-line controls let you adjust music and microphone volume, or mute the microphone, with just a touch.
Comfortable headband and soft, swivel-mounted ear cushions deliver complete comfort.