Merlin (console) in the context of "Handheld game console"

A handheld game console, or simply handheld console, is a small, portable self-contained video game console with a built-in screen, game controls and speakers. Handheld game consoles are smaller than home video game consoles and contain the console, screen, speakers, and controls in one unit, allowing players to carry them and play them at any time or place.

In 1976, Mattel introduced the first handheld electronic game with the release of Auto Race. Later, several companies—including Coleco and Milton Bradley—made their own single-game, lightweight table-top or handheld electronic game devices. The first commercially successful handheld console was Merlin from 1978, which sold more than 5 million units. The first handheld game console with interchangeable cartridges is the Milton Bradley Microvision in 1979.