MSI IM-945GC User Manual page 24

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Audio Ports
These audio connectors are used for audio devices. You can differentiate the color
of the audio jacks for different audio sound effects.
Line-In (Blue) - Line In, is used for external CD player, tapeplayer or other
Line-Out (Green) - Line Out, is a connector for speakers or headphones.
Mic (Pink) - Mic, is a connector for microphones.
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audio devices.