Just bought a GameCube with this on it. What is it? : r/Gamecube
Game Boy Player - Wikipedia
4 wavebirds,1 cube,1 Gameboy Player,1 broadband adapter,1 1019 block memory card, and one mythical Component cable. As Star Fox would say...Mission Complete! Or Accomplished if you beat the levels special path lol.
Nintendo Game Cube Broadband Adapter (DOL-015) for sale online | eBay