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Cyber Acoustics (Ac-201-4) 4-Pack Speech Recognition Stereo Headset With Boom MicSilver Retail Packaging, clamshell with backerboardThe PCvoiceLINK, AC-201 is a stereo headset mic. It uses our special noise canceling technology. This amplified microphone element can be used for speech recognition, voice over the internet, and telephony applications..