The Yealink EHS35 Wireless Headset Adapter provides a technical interface between your Yealink IP phones (T3X) and a compatible Yealink wireless headset (WH62/WH63). Easy to use Easy Plug and Play installation, Control phone calls, answer phone, muting, hanging up, volume, etc. Please note: Only compatible with T3X-series IP phones and WH62/WH63 headsets!