VoIP Circuit

With an adjustable over-the-head design, the Plantronics 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.

This is just the replacement headset alone.