Acer 5600 series User Manual page 21

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Note: The system has two microphone-in jacks (front and rear).
However, you can not use both of them at the same time. By
default, your system enables the microphone-in jack in front and
disables the one at the back.
Description
Optical drive emergency eject hole
Optical drive LED
Volume control
5.25-inch drive bay
Headphone/Earphone port
Front microphone-in port (see Note)
USB ports
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