The QD-RJ9-CORD is a Quick Disconnect (QD) to RJ9 converter for Yealink YHS34, YHS34 Lite, and YHS36 headsets for easy connection with any Yealink phone. The QD-RJ9-CORD allows you to easily connect a YHS Series headset to a Yealink phone, ensuring a reliable connection. The phone can automatically optimise acoustic parameters for your YHS headset.