Wii U GamePad's sensors may require occasional calibration - Polygon

A Nintendo employee pinned the performance problems on "interference"

Wii U Gamepad Silicone Jacket - Black : Video Games

Buy SIBIONO - Wireless Bluetooth Dual Analog Joystick for Nintendo Wii U Pro Controller Gamepad.: Gamepads & Standard Controllers - ✓ FREE

SIBIONO - Wireless Bluetooth Dual Analog Joystick for Nintendo Wii U Pro Controller Gamepad.

Nintendo Switch, Ultimate Pop Culture Wiki

Wii U to be region-locked, like it's 2005 or something - CNET

Wii U Gamepad Sync Problem (Range Issues Fix) - Connection With

Sony has a patent for a new PlayStation controller : r/Games

Hardware Review: Nintendo Switch: Nintendo's Most Important

Wii U review

The Legend of Zelda: Skyward Sword - Dolphin Emulator Wiki

Nintendo Wii U controller – an annotated graphic – Engineering

Psbook, PDF, Play Station

Nintendo Wii (original, Wii Sports bundle) review: Nintendo Wii

20 Best-Selling Consoles Of All Time - GameSpot