Asus M33AAG - Manual (Page 14)

14 Chapter 1: Getting started
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Rear panel
Headphone port. This port connects to a headphone or speaker. Supported by
ASUS Audio Wizard.
Power button. Press this button to turn on your computer.
Optical disk drive eject button. Press this button to eject the optical disk drive
tray.
Optical disk drive bay. There is an optical disk drive in this bay.
M32 / M33 Series
Voltage selector switch. Switch to select the appropriate system input voltage.
This switch may be available in some model types only.