Audio: HD Voice/Wideband speaker performance, Rotation: 330° bendable boom arm for easy adjustment without breaking, Headset cable length: 0.9m, QD to RJ9 cable length: 1.2m, Color: Black, Microphone frequency response range: 100 Hz-8 kHz, Speaker size: 28mm, Warranty: 01 Year Limited Warranty. 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. Perfect match with Yealink desk phones gives you optimized audio quality.