With an adjustable over-the-head design the S11 Telephone Headset System brings hands-free convenience and comfort to home and office workers who rely extensively on the phone. Compatible with virtually any phone this system features a single-ear headset that lets users keep an ear on their surroundings. A noise-canceling microphone and Call Clarity technology filter phone and room noise keeping communications clear and free of annoying background noises. Headset Type: Monaural Headset Style: Over The Head Earpiece Type: Ear Cushions Earpiece Material: Foam.