Dell Studio XPS M1640 (Mid 2010) - Manual (Page 25)

23
Using Your Studio XPS Laptop
Media, Wireless, and Power Controls
To use the media, wireless, and power controls, lightly touch the symbol and then release.
The control’s symbol will shine for 2 seconds to confirm your selection then fade away.
Turn on power, or wake up from sleep
state
Turn on wireless
Play the previous track or chapter
Stop
Play or pause
Play the next track or chapter
Mute the sound
Turn down the volume
Turn up the volume
Eject the disc