The Game Boy is a Nintendo manufactured portable handheld released initially in 1989.It was the first dedicated 8-bit handheld system from the company using interchangeable cartridges to play many different titles. 

It features a 2.6" 4-shade LCD, stereo sound through headphones, and interchangeable cartridges. The button layout was based on that of the Nintendo Entertainment System controller. 

It uses 4 AA batteries, but could also be used with an AC Adapter to power the system from a wall socket. Of the many handheld systems to use ROM cartridges, the Game Boy was the most popular of its time. 

Various video games such as Tetris, Super Mario Land, Kirby's Dream Land, and Pokémon games led the system to a very long life.