DESC: The most versatile headset ever! The innovative Plantronics DuoPro offers all-day comfort and best-in-class sound quality. The DuoPro is available in convertible, over-the-head, over-the-ear and now behind-the-head models with noise-canceling microphone or the Plantronics trademark voice tube. New ergonomic innovations offer unsurpassed comfort, and a unique anti-twist boom ensures perfect microphone placement.