This auction includes the power supply.  Everything has been tested, and works perfectly. 

It has 12 programmable G keys (G1-G12) in 3 banks (M1-M3), giving you 36 programmable keys.  

The LCD can show you a variety of things. 

It has a "gaming" mode slider switch, which locks out the Windows keys, so you won't accidentally pull up the Windows menu while gaming.  

It has the full set of multimedia keys and a volume roller.

This uses the Logitech Gaming Software (LGS).  There are 3rd party software options for additional LCD functionality.  Tested on Windows and Linux.

* Laptop not included.