ポケモン赤・緑 GAME MUSIC COLLECTION with GAME BOY型さいせいマシン

This set contains a small Game Boy Jukebox, modeled after the original Game Boy, and 45 cartridges modeled after the Pokémon Red and Pokémon Green game cartridges. Each cartridge represents a different song in the soundtrack.

The cartridges don't contain any music. Rather, the bottoms have plastic tabs that push down the pins in the player in a specific way for each song. Turning on the player, the Game Boy startup sound will play, followed by the song the cartridge activates, which will loop after if not turned off. If no cartridge is inserted, just the startup sound will play.