The Jabra Evolve 20 is a Monaural corded headset that is ideal for use with a VoIP softphone. Jabra have included their Noise Cancelling microphone, DSP technology and Wideband audio to filter out unwanted background noise and optimise your voice. The Evolve 20 Mono also comes with a in-line control unit that provides accesses to call functions such as volume, mute answer and end.