8Bitdo Gbros. Wireless Adapter for Nintendo Switch (Works with Wired GameCube & Classic Edition Controllers) - Nintendo Switch

Play your Switch with your original wired controllers like Gamecube, NES, SNES, SFC Classic Edition and Wii Classic.
GBros. connects your original wired Gamecube controller to your Switch just like a Wiimote. It even has built in home and screenshot buttons.
GBros. has a built in toggle that allows you to connect to your Switch and X-input capable software on Windows.
Requires two AA batteries for 30 hours of gameplay time (not included, sold separately)
Includes: GBros. Adapter, Cable band, USB Cable and manual