Yealink EHS40 Wireless Headset Adapter / USB (EHS40) The new and advanced Yealink Headset Adapter EHS40 provides a technical interface between your Yealink IP Phones T58A / T57W / T54W / T53W / T53 / T48S / T46S / T42S / T41S and a compatible device, including wireless models from Jabra, Plantronics and Sennheiser. Highlights: Wireless headset adapter Control the call via a wireless headset 1 x USB 2.0, x RJ45 (8P8C), 1 x RJ9 (4P4C) Easy to use Make and receive calls anywhere