The Game Boy, Nintendo’s first full-sized handheld device, was released in Japan on April 21, 1989. It featured a green LCD screen, a directional pad, A, B, and start and select buttons. It was released in America in August of the same year for $89.99. Over the next decade and a half, the original Game Boy and its upgrades like Game Boy Color would sell 118 million units worldwide.
Take a look at this Mashable article for Every Game Boy Model from the Past 25 Years.