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