Sennheiser DeskMate Single-Ear Cord Office Headset With Connector Cord for Avaya, Polycom, Alcatel, Aastra, Nortel Select Models Noise-canceling microphone  helps reduce background noise Unparalleled comfort  with a leatherette ear cushion, flexible headband and German design, the DeskMate is the most comfortable headset in the world 4-year full-replacement warranty  the best of ANY headset available Direct connect  plug directly into specific Avaya, Polycom, Alcatel, Aastra and Nortel Phones Quick disconnect cord  step away from your desk without removing your DeskMate