The adapter gives you a way to use not just your GameCube controller, but also a handful of wired Nintendo controllers (Wii Classic, NES Classic and SNES Classic) with a Switch or a Windows PC. Just plug your wired controller into GBros., and it will connect to your device via Bluetooth. The accessory even comes with built-in home and screenshot buttons.

GBros. will set you back $20 and is now available for pre-order via Amazon. It will start shipping on December 7th, the same day Smash Ultimate drops.

Update: Clarified wording on which controllers are compatible with the GBros.