Delivering the very best in sound quality and all-day comfort for call center and office professions. The uniquely balanced design works equally well for eyeglass users. With four sizes of user-selectable earbuds and an adjustable receiver arm, the TriStar H81N over-the-ear style headset can be custom fitted to just about anyone. Weighing under one-half ounce, this headset is a pleasure to wear. Quick Disconnect™ lets you walk away from your phone while wearing your headset, noise-canceling microphone improves clarity of speech. As the H81N requires a Plantronics amplifier to connect to your telephone, we've put together a package with the Vista^TM M22 Amplifier to give you the best in durability and reliability. The VistaM22 amplifier includes near-universal compatibility with single and multi-line telephones, as well as ergonomically designed volume, headset/handset and mute controls.