Game Boy Advance Communication Cable "AGB-005" Game Boy Communication Cable "DMG-04" The black one is for the Game Boy, and the blue one is for use with the Game Boy Advance and Game Boy Advance SP for communication battles and data exchange. Both are genuine Nintendo products. I think both are in good condition considering their age. I don't currently own a game console, so I haven't been able to confirm their operation. I think they should work, but I'll treat them as junk items. GBA Game Boy Advance Nintendo AGB005 DMG04