The Game Gear has a colour screen, a speaker, and needs six AA batteries (for 4 hours of play-time) to run. It is bigger and costs more money than the Nintendo Game Boy. It also uses more electric power than the Game Boy, so the Game Gear's batteries must be replaced more often.
There are special add-ons for the Game Gear, such as a TV-Tuner that allows people to watch television on it.
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Sega Game Gear Facts for Kids. Kiddle Encyclopedia.