I've got someone locally that will sell a Gameboy Advance SP.

I've already got a regular GBA SP, but I've always wanted the redesigned one with the new brighter screen (released around the same time as the GB Micro).

The only thing is that he does not have the box, and has lost the charger, it's just the GBA SP (which is in great condition) and he doesn't know whether its the old or new version. (I told him to toggle the light button to see if it shuts the light off or varies the brightness, but with no charger that's impossible).

So, is there any way short of meeting with this guy and plugging it in with my charger to determine whether its an original GBA SP or a newer one with the brighter screen? Can I figure it out with model or serial number? Also, it is a flame red version, if that helps at all.

Any help is greatly appreciated!