Supervoice SVC-121 is a professional HD mono headset with advanced uni-directional noise cancelling microphone and quick-disconnect (QD) cable, ideal for office and call-center staff. With super light weight design, 60mm adjustable steel headband, 330° rotatable microphone boom and 180° rotatable joint of speaker and headband, ensures exceptional user comfort for all day use. The SVC-121 delivers superb wideband HD audio quality with excellent noise cancellation technology and remarkable anti-acoustic shock circuit. Moreover, users have the ability to leave desk without taking off their headset, due to the QD adapter. This headset is compatible with all IP and analog devices, enabling multiple connection choices with the optionally available QD bottom cables, such as QD to RJ9, QD to 3.5mm stereo plug, QD to USB 2.0 and more.