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Plantronics P420-M USB Speakerphone
7
For Windows Vista, click on the following: “Start”, “Control Panel”,
“Hardware and Sound”, “Sound – Manage Audio Devices”. From
there, select the Playback tab and make any further adjustments
to the P420-M (speaker) settings. Then select the Recording tab
and make any further adjustments to the P420-M (microphone)
settings.