The Game & Watch brand (Japanese: ゲーム&ウオッチ Gēmu & Uotchi; called Tricotronic in West Germany and Austria, abbreviated as G&W) is a series of handheld electronic games developed, manufactured, released and marketed by Nintendo from 1980 to 1991. Created by game designer Gunpei Yokoi, the product derived its name from its featuring a single game as well as a clock on an LCD screen. The models from 1981 onwards featured an alarm in addition. The series sold a combined 43.4 million units worldwide and was the earliest Nintendo video game product to gain major success. The units are based on a 4-bit CPU, from the Sharp SM5xx family, that includes a small ROM and RAM area and an LCD screen driver circuit.