This entry refers to the Game Boy Advance SP portable console. Since this system was not region locked, it encompasses all regions in which it was sold.

From Wikipedia:

First released in Japan February 14, 2003, the Game Boy Advance SP — Nintendo model AGS-001 — resolved several problems with the original Game Boy Advance model. It featured a new smaller clamshell design with a flip-up screen, a switchable internal frontlight, a rechargeable battery, and the omission of the headphone jack, which requires a special adapter to be purchased separately. In some regions owners of the original Game Boy Advance received a special limited offer to trade their old models into Nintendo and merely pay the difference on the Advance SP.[citation needed] In mid September 2005, Nintendo released a significantly improved SP model, unofficially dubbed the "Mark II" or GBA SP +, in North America, and officially Nintendo model number AGS-101, that featured a high quality backlit screen instead of a frontlit, similar to the Game Boy Micro screen but larger.

Trivia:

• Nintendo ran a promotion where 6 tickets for a 24k gold Game Boy Advance SP prize were hidden in the boxes of regular Game Boy Advance SP. To date no one has come forth with a gold Game Boy Advance SP. The prizes went seemingly unclaimed.