Jabra Evolve 20 Stereo UC - Professional Unified Communicaton Headset Stay focused by eliminating distraction in noisy open office environments Made for both music and voice with a world-class set of microphones and speakers Let you, not the task, decide where you work by PC based connection via USB control unit Each variant has passive noise cancellation as standard to give you protection against high frequency noise Discreet boom arm easily tucks into the headband when not in use