DESC: Plantronics, Inc. : Features a microphone adjust switch for optimizing transit volume. Combines premium audio performance with sleek, comfortable styling. Noise-cancelling microphone blocks out background noise so your calls have better clarity. Comfortable ear cushions and earloop are ideal for extended use. Headset Type: Monaural; Headset Style: Convertible Heads-Over The Ear/Head; Earpiece Type: Leatherette Ear Cushion and Earloop; Earpiece Material: N\A.