Lenovo IdeaCentre K330 - Manual (Page 12)

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User Guide
1.3.5 If you have audio devices, attach them using the
following instructions.
Audio line-in This connector receives audio signals from an external audio
device, such as a stereo system.
Audio line-out This connector sends audio signals from the computer to
external devices, such as powered stereo speakers.
Microphone Use this connector to attach a microphone to your
computer when you want to record sound or if you use
speech-recognition software. This connector might be
located on the front of the computer.
Headphone Use this connector to attach headphones to your computer
when you want to listen to music or other sounds without
disturbing anyone. This connector might be located on the
front of the computer.