The Game Boy Advance is a sixth-generation handheld console designed to play proprietary videogame cartridges. It is backwards-compatible with both the Game Boy and the Game Boy Color. In addition to the features of the Game Boy Color, it features a horizontal design, considerably improved processor, and two shoulder buttons. The Game Boy Advance SP, released on March 23, 2002, features a clamshell design, a rechargeable battery, and a screen light. The final iteration of the Game Boy is the Game Boy Micro, released on September 19, 2005 and featuring a backlight and a much smaller form factor. It is only compatible with Game Boy Advance games.