Handsfree working has never been so flexible! The DuoPro headset family offers you the ultimate in headset versatility; providing outstanding comfort, excellent sound quality and is the first professional headset to be available with a behind-the-head wearing option.The new behind-the-head neckband with its modern styling, gives you all the comfort you would expect from a headband, combined with the discrete look of an over-the-ear design. The new design complements the existing headband and over-the-ear styles. The unique double T-pad headband and ergonomically designed earloop means the speaker pad does not press against your ear. DuoPro features advanced speaker technology for optimum voice clarity and all models are available with the Plantronics trademark voice tube or noise-canceling microphone. The DuoPro headset also has a patent-pending anti-twist boom for perfect placement every time. So, if you are looking for extra productivity, comfort and fashionable style, all in one neat package, DuoPro is the answer.DuoPro H171N is the convertible model with a noise-canceling microphone. New ergonomic innovations offer unsurpassed comfort, and the patent-pending anti-twist boom ensures perfect microphone placement.