* LCD display.
* Backlight (low/hi/off)
Following keys are "dead"
To get something to show in the LCD screen rather than just "G15" i installed the G15 daemon:
'sudo apt-get install g15daemon'
And then to get it to show something fancy i installed G15 Stats:
'sudo apt-get install g15stats'
I wouldn't recommend buying this keyboard if you want to use all the features it has since it has no official support for linux, yet.