Plantronics PTH-200 Modified VT Tristar Headset is a modified version of the TriStar noise canceling headset, made for use with the Spectralink system. The special shielding in the cord mitigates a buzz sound which would otherwise occur with a standard Plantronics headset. The PTH-200 Modified VT Tristar Headset comes with the necessary cord to connect to Spectralink so no additional parts are required. Covered by 2 year factory warranty.