Sony VGN-SR490DDB - Manual (Page 106)

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Using Peripheral Devices >
Connecting an External Microphone
Connecting an External Microphone
If you use a sound input device (for example, to chat over the Internet), you need to connect an external microphone (not
supplied).
To connect an external microphone
Plug the microphone cable (1) into the microphone jack (2) m.
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Make sure your microphone is designed for computer use.