The Game Boy (DMG-01 model) is a Nintendo manufactured portable handheld released initially in 1987. It was the first dedicated 8-bit handheld system from the company using interchangeable cartridges to play many different titles. It featured 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 used 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.