Supra Monaural headsets, with sound in one ear, are lightweight and are ideal for users who may need to confer with colleagues when making or taking a call. Supports Call Clarity and patented SoundGuard Plus technologies for superior sound Adjustable headband provides an ultra-stable fit Soft ear cushion for comfort Lightweight- only 1.7 oz/49g 10' coil cord with Quick DisconnectTM option Clear adjustable voice tube Adjustable clothing clip H51: Supra Monaural Headset Supra H51 Monaural Headset Headset Loracomm Headset Express Plantronics H51: Supra Monaural Headset