Blackwire C435-M Computer Headset for Lync (85801-01). The Blackwire C435-M for Microsoft Lync provides a choice on monaural or binaural (Stereo) audio options and wearing styles, Noise-canceling mic reduces background noise interruptions, Answer/end/mute controls simplify call management while inline indicator lights show call or mute status, and a durable protective carrying case and the superior audio quality you've come to expect from Plantronics - the new Blackwire C435-M has the perfect balance of style, flexibility and sound. Plantronics