Wired Headset with QD to RJ Port Perfectly Compatible with Yealink Phones Runs right out of the box, a QD to RJ9 plug-and-play setup makes the connectivity to Yealink IP phones at ease. The phones can automatically optimize acoustic parameters for your YHS34/YHS34 Lite. Perfect match with Yealink desk phones gives you optimized audio quality. Ultra Lightweight Design Built for comfort with soft ear cushions and ultra-lightweight materials, the YHS34/ YHS34 Lite is 10%~30% lighter than other headsets in the same range. The extremely lightweight design enables all-day wearing comfortable without pressure. All Day Wearing Comfort Designed with replaceable soft leather (YHS34) and foamy (YHS34 Lite) ear cushions, the headset can softly cover the ear and support long conference calls, which keeps you enjoying supreme comfort all the time. ' High-Quality Audio Experience Made for calls, YHS34/YHS34 Lite is kitted out with a high signal-to-noise ratio speaker and independent cavity design. The passive noise cancellation creates a richer and clearer conversation with reduced background noise.