Over-the-ear headset with voice tube offers superior sound and an innovative three-point design that provides ultimate stability with supports behind, on top of, and on the ear. Voice tube delivers great sound quality. Design offers four user-selectable, earbud sizes and an adjustable receiver arm for a precise fit. Quick Disconnect lets you leave your desk without removing the headset or disconnecting the caller. Wear on either ear. Headset is exceptionally lightweight at less than 1/2 oz. and requires an adapter or audio processor (M22).