The GameCube Controller Adapter allows you to connect up to four Gamecube

controllers(or Gamecube Wavebird Wireless Controllers) to a Wii U system and PC USB.

Switch to "WII U" or "PC" mode by using the switch located on the side.
Supports Super Smash Bros. for Wii U
The driver is required if you need the vibration feedback on PC mode.
Compatible with Windows XP,Vista,Windows 7,Windows 8,32 bit and 64

 bit and Mac OS under the PC mode.