From Rare Gaming Dump

The CAT-R is a game development console produced by Nintendo for the Wii U. The console itself looks like a regular Wii U with the exception of the front panel being green. The included Wii U GamePad is also green on the back. The console has a Bluetooth connector and two DRC (Wii U GamePad) connectors on the backside of the main unit. The unit is also able to switch between a wired and wireless mode for the BT and GamePad connections. This unit is the 'test kit' Wii U development unit (the equivalent to the Wii's RVT-R Reader or the GameCube's NR Reader, intended as a low-cost option for game testing as well as a general-purpose development solution for indie studios. The other Wii U development kit is the CAT-DEV.