8BitDo - 8BitDo USB Wireless Adapter 2 is compatible with Xbox Series and Xbox One Bluetooth controllers, PS5, PS4, Switch Pro, Joy-Con, Wii U Pro, and all 8BitDo Bluetooth controllers on Windows,
How to use 8bitdo USB Adapter with WiiU Pro Controller - YouTube
8BitDo on Twitter: "GBros. is a wireless adapter that works like a Wiimote. Made for SUPER SMASH BROS ULTIMATE!! Play your Switch with your original wired controllers like Gamecube, NES, SNES, SFC