Extremely versatile headset can be worn over the ear, over the head or behind the head with optional neckband wearing styles. Unique double T-pad headband distributes weight evenly so there's never a speaker pad pressing on your ear. Patent-pending pivoting anti-twist boom ensures perfect microphone placement and performance. Headset delivers all day wearing comfort and best-in-class sound quality. Quick connect feature lets you walk away from your phone while wearing your headset. Ergonomic innovations offer unsurpassed comfort. Headset requires an amplifier (PLN M22) or adapter (PLN P10).