. 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 Evolve 40 features leatherette ear cushions busy light (indicating in use/busy) & has a 3.5mm hard wired jack (i.e. for direct connection to music sources) with a separate control module (with 3.5mm input & USB (Universal Serial Bus) for connection to computer). This model is MONO Sound (single ear) & features Premium noise Cancelling Technology & a soft pouch included as standard. The Evolve 40 also features microphone boom that can be integrated into the headband when not on a call or simply listening to music..