The original Game Boy made its debut in 1989, and was about 4″ x 7″ in size. In 1997 the Game Boy Pocket was released, measuring at a reduced 3″ x 5″. In 1998, the Game Boy Color was released, succeeding the monochrome original. In 2001 a complete update was made to the line with the Game Boy Advance. The Advance included a new shape, improved sound, and more complex graphics (from 8 bit to 32 bit). Due to complaints over the Advance's lack of a back light, the upgraded Game Boy Advance SP was released in 2003; the SP had a folding case, an LCD screen with back light, and a rechargeable lithium battery. Currently, Nintendo's stake in the portable gaming market is based on the Nintendo DS (2005).