A handheld game console is a lightweight, portable video game console with a built-in screen, game controls, and speakers.D 4.1 – Standards and technology monitoring report [revised version]. University of Maribor. Sixth Framework Programme (European Community). 24 April 2007. p. 20. Handheld game consoles are smaller than home video game consoles and contain the console, screen, speakers, and controls in one unit, allowing people 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 oldest true handheld game console with interchangeable cartridges is the Milton Bradley Microvision in 1979. Nintendo is credited with popularizing the handheld console concept with the release of the Game Boy in 1989 and as of 2014 continues to dominate the handheld console market with their Nintendo 2DS and 3DS systems.