Greg from Laser Bear Industries on X: "Tested out a few Bluetooth adapters for wired GameCube controllers. Hands down the 8bitdo GBros is the only one worthwhile for #BlueRetro on the GameCube.
Amazon.com: 8Bitdo Gbros. Wireless Adapter for Nintendo Switch (Works with Wired GameCube & Classic Edition Controllers) - Nintendo Switch : Everything Else
8Bitdo Gbros. Wireless Adapter for Nintendo Switch – SupremeGameGear
8Bitdo Gbros. Wireless Adapter for Nintendo Switch