Check the listing for details. Yealink Yealink Headset Adapter EHS40 USB EHS40 UPC 841885103680 - Networking.... Color: Black, Condition: New. Listed at 94.00 USD. Experience the freedom of wireless communication with the Yealink EHS40 Headset Adapter. Designed to seamlessly integrate with your USB-enabled devices, this adapter allows you to enjoy the convenience of untethered audio without compromising on quality. The sleek black design is both aesthetically pleasing and practical, ensuring that your headset and earpieces are stored safely when not in use. Crafted for singular use with its single earpiece design, the EHS40 is a must-have for professionals on the go. Its LIGHTSPEED wireless technology ensures quick and efficient audio transmission, while the on-cable microphone provides clear sound quality. With no manufacturer warranty, this unit stands as a reliable accessory straight out of the box, ready to enhance your networking experience.