Plantronics Blackwire C320M Corded Headset Plantronics Blackwire C320M Comfort Meets Strong Design With Plantronics Blackwire C320M intuitive, inline controls let you answer/end, and control the number of PC calling with ease. Smartly placed sign illumination and beneficial sound alerts give call, and volume status. Plantronics Blackwire C320M has simple plug-and-play USB connectivity Lightweight metal headscarf provides durability and an individualized, relaxed fit Convenient wearing designs available, binaural or monaural design Plantronics Blackwire C320M Stereo Microsoft Corded HeadsetExcellent Audio Quality Wideband provides improved discussion excellent, providing the best possible PC sound quality Dynamic EQ function immediately adjusts sound for discussion or press use Noise-canceling micro-phone take a position reduces back drop noise Enhanced Digital Indication Managing provides more natural showing voice