Wired Headset with QD to RJ Port Perfectly Compatible with Yealink Phones Runs right out of the box, a QD (Quick Disconnect) to RJ9 plug-and-play setup ensures the connectivity to Yealink Desk phones. Perfect match with Yealink desk phones give you optimized audio quality and more enhanced functions. Noise-Canceling Microphone The noise-canceling microphone allows for the most reduction of outside noise, so the listeners can focus more on the desired sound at hand, the nearby talkers are protected with most call privacy as well. Excellent Audio Experience Made for calls, this headset is kitted out with wideband HD audio technology and passive noise cancellation that ensures a richer and clearer conversations, eliminates background noises as well. All Day Wearing Comfort The over-the-head wearing style, ultra-lightweight materials, and bio-mimetic protein-based leather ear cushions make your head and ears feel relaxed. Its ergonomic design enables the YHS36 comfortable enough for long conference calls and all day use.