Review on Wirelessly Connect Any Controller To Your Gaming System With 8BitDo USB Adapter 2 Converter Dongle by Quinton Wonsley

Works to use a WiiU Pro Controller with the Nintendo Switch. Took a few tries to sync it the first time but since then it syncs without a problem.The bulkiness of the receiver make it look like it you could not fit two in the two front USB ports (which is as much a design flaw with the Switch Dock as the item) so that's a minus. But to get a full function controller (since I already have a pro controller have not tested with PS4 controllers) for $20 is a steal.