Wii U GamePad Review

6600mAh High Capacity Battery for Nintendo Wii U Gamepad Rechargeable Long Lasting Battery, Fix Dead Power

Wii U GamePad - Wii U Guide - IGN

Wireless Bluetooth Controller Gamepad for Nintendo Wii U Pro Game Joystick, Black

Black Nintendo Wii U Gamepad - GAMEPAD ONLY

I've compared the prototype E3 gamepad against the retail version. Nintendo did make some changes after the E3 in 2011 when they exhibited the console. : r/wiiu

Nintendo at E3: Wii U, Pro Controller, 'Miiverse' online services, and new games - The Verge

Nintendo Wii U Pro Controller Review

Nintendo Wii U review: ​A great game system for kids, but its successor is on the horizon - CNET

This picture of the Nintendo Switch and Wii U is kind of mind

Skinomi TechSkin - Nintendo Wii U GamePad Brushed Aluminum Skin Protector