Sony VGN-AR170GU1 - Manual (Page 33)

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Using Your VAIO Computer
VOLUME buttons
Decrease (-) and increase (+) the volume.
Disc drive eject button
Ejects the optical disc drive tray.
If this button does not work, try the substitute drive eject button on the optical disc drive.
Muting button
Turns the volume on and off.
* On selected models only.
Special-function button Functions