Back input slots: AC adapter slot, AV slot, HDMI slot, USB slot x2
Power supply: Dedicated AC adapter (WUP-002)
Dimensions: 46mm vertically x 172mm horizontally x 268.5mm thick
Mass: Approximately 1550g
GameCube Controller Adapter for Wii U
The GameCube Controller Adapter allows connection to the Wii U with up to four GameCube controllers, and was released on December 6th, 2014. It was only compatible with "Super Smash Bros. for Wii U" and cannot be used for Wii software. However, it can also be used with the Nintendo Switch, system version 4.0.0 or later. After this update for Switch was released, new GameCube Controller Adapters were released with a standard Nintendo logo instead of a Wii U logo.
WUP-901
Wii U (Event model)
This unusually numbered Wii U model is essentially a regular Wii U console in most areas of usage, but the back has been modified to include two ports for wired Wii U Gamepads to connect to, and the console has a cheaper, worse 5GHz WiFi module than a standard model. This model was apparently used for certain events, though it's currently unknown why this model was used rather than the Wii U kiosk console, WIS-001.