. The Evolve range of headsets from Jabra are VOIP UC headsets designed for softphones and computer use its unique feature of this range of headsets is the improved concentration they provide with large earcups and premium noise cancellation providing a \'concentration zone\' around the wearer. Particularly useful in noisy open office environments.Models across the range are available either Mono (single ear) and Stereo (dual ear) standard UC (Unified Communications) or MS (Microsoft Lync Optimised) and some models feature a \'busy\' (in use) light warning your colleagues you are on a call or busy. The Evolve range are also designed for both music and voice further blocking out background distractions and enabling to work in your \'own zone\' day in / day out!This Entry-Level Evolve 20 features foam ear cushions in-line control module and hard-wired USB connection only. This model is MONO Sound also and features Premium noise Cancelling Technology..