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.