Sony VGN-TX00 - Manual (Page 31)

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Using Your VAIO Computer
Disc drive eject button
Ejects the drive tray.
If this button does not work, try the substitute drive eject button on the optical disc drive.
Mute button Turns the speaker and microphone volume on and off.
Volume buttons
(Volume up and Volume down) Increase and decrease the volume.
Special-function button Functions