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The Game Boy micro is much smaller, and has a brighter, adjustable, screen. The Game Boy micro plays all Game Boy Advance game paks. The Game Boy micro is not compatible with Game Boy Color or original Game Boy games and accessories. The Game Boy micro is not compatible with accessories made for the Game Boy Advance and Game Boy Advance SP. 

No, for iPhone there isn't an emulator, mostly because you can only play emulators if you own the game and somehow copied him to a computer to save it.

The average battery life is approximately 15 hours when playing Game Boy Advance games. This is somewhat less when playing Game Boy Color or Game Boy (original) games. Battery life can also vary depending on the Game Pak being used and the volume setting (louder=less play time). 

The following Game Boy and Game Boy Color accessories are compatible with the Game Boy Advance: Game Boy Printer, Game Boy Camera, Stereo Headphones, Universal Game Link Cable, Universal Game Link Cable Adapter , Izek Sewing Machine. 

The Game Boy micro can only play Game Boy Advance game paks. It is not compatible with older games made for the Game Boy Color or original Game Boy. 

Due to the smaller design of the Game Boy micro, it is not compatible with any original Game Boy or Game Boy Color games, accessories, or systems.