"The Game Boy Color (ゲームボーイカラー, Gēmu Bōi Karā") is Nintendo's successor to the Game Boy and was released on October 21, 1998 in Japan, November 19, 1998 in North America, November 23, 1998 in Europe and November 27, 1998 in UK. It features a color screen and is slightly thicker and taller than the Game Boy Pocket. As with the original Game Boy, it has an 8-bit processor. The Game Boy and Game Boy Color combined have sold 118.69 million units worldwide."
Source: Wikipedia, "Game_Boy_Color", available under the CC-BY-SA License.