Microphone Connector; Connecting An External Microphone - Sony Vaio PCG-C1MHP User Manual

Connecting peripheral devices
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Connecting an external microphone

Your VAIO notebook contains an internal microphone. If you need to use a sound input device, for example
to chat on the Internet, you can also plug in an external microphone.
To connect an external microphone, proceed as follows:
Plug the microphone cable (1) into the microphone connector (2) identified by the symbol.
Make sure your microphone is designed for computer use.