Yealink EHS35 Wireless Headset Adapter Supports T31P/T31G/T33G, Compatible With Yealink Wireless Headsets. The unit is easy to install, simply connect the EHS35 to the RJ9 (4P4C) headset. Its plug-and-play effectively allows you remotely control your Yealink T3X phone calls, including answering, rejecting, holding, muting, hanging up, switching between multiple calls, and adjusting the volume. When using the EHS35 with Yealink/Avaya/Poly/Snom/ Grandstream/Fanvil desktop phone, it can provide audio but without remote control feature. It is specially designed to ensure maximum productivity in business applications such as receptions and call centers and is ideal for the Corporate, Financial, Health, Government, Educational, Industrial, and SME/SoHo market sectors. Key Features ● Plug and play ● Easy to use ● Support Yealink WH62/WH63 headset only ● Compatible with IP Phone_ 1) Yealink IP phones (T3X) with remote control feature 2) Yealink (T4X/T5X)/Avaya/Poly/Snom/Grandstream/Fanvil desktop phone without remote control feature * Remote control feature_ answer, reject, hold, mute, hang up, switch between multiple calls, and adjust the volume.