Line In jack
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Line in jack A. Microphone jack
B. Line in jack
C. Headphone jack

Component Icon Description
A. Microphone jack Microphone jack Plug a microphone into this jack.
B. Line in jack Line in jack Connect an external audio input source, such as a stereo, into this jack so that you can record sound on your computer or play sound through the computer speakers.
C. Headphone jack Headphone jack Plug amplified speakers or headphones into this jack. The built-in speakers are turned off when headphones are plugged into this jack. The headphone jack on the optional port replicator is turned off when headphones are plugged into this jack.