Game Boy
In March 2001, Nintendo introduced the Game Boy Advance, the first major technological upgrade in the Game Boy line. Nintendo later released two revised models of the Game Boy Advance, the Game Boy Advance SP and the Game Boy Micro in 2003 and 2005, respectively. The Game Boy Advance SP features a smaller clamshell design, and introduced a built-in screen light and rechargeable battery which became standard features for future Nintendo handhelds. The Game Boy Micro is an even smaller variant with interchangeable designer faceplates. Unlike the previous models, the Micro lacks Game Boy/Game Boy Color backwards compatibility and e-Reader support. As of June 30, 2010, the three Game Boy Advance models have sold 81.51 million units worldwide.