. The Evolve range of headsets from Jabra are VOIP UC headsets designed for softphones & computer use its unique feature of this range of headsets is the enhanced concentration they provide with large earcups & 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) & Stereo (dual ear) standard UC (Unified Communications) or MS (Microsoft Lync Optimised) & 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 & voice further blocking out background distractions & enabling to work in your 'own zone' day in / day out! This Entry-Level Evolve 20 features foam ear cushions in-line control module & hard-wired USB (Universal Serial Bus) connection only. This model is MONO Sound also & features Premium noise Cancelling Technology..