New Plantronics Blackwire C610 M Moc Noise Canceling Microphone Hi Fi Stereo Sound Volume Adjustment Plantronics Blackwire C610M headset for Microsoft Office Communicator. Professional grade wideband audio optimized for PC communication environments where frequent softphone conference calls take place. Noise-canceling microphone limits outside noise interruptions, ensuring excellent audio quality and easing listener fatigue. Echo cancellation for full-duplex speakerphones when both the microphone and speaker are on at the same time. Hi-Fi stereo sound ensures audio quality for calls and multimedia applications like music, video conferencing, etc.