Acer 5600 series - Manual (Page 57)

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• earphones, headphones: connect to the Headphone-out port
(lime port) located on the front panel of your computer
Note: To adjust the volume of the headphones, click the Volume
icon located on the taskbar at the bottom of your screen. When
the volume control pops up, drag the Volume control lever to the
desired level. You can also use the Volume control/mute knob on
the keyboard.