check the voltage on the plug. PAL (which runs on machines with 240v thereabouts) and NTSC-J for Japan and NTSC-US for the U.S. (which both run on 110v thereabouts).
It depends on where you bought your console. If you bought it in Asia the region is NTSC-J, North American is NTSC U/C, Europe and Oceania is PAL, PAL/E. And China is NTSC-C.
check the voltage on the plug. PAL (which runs on machines with 240v thereabouts) and NTSC-J for Japan and NTSC-US for the U.S. (which both run on 110v thereabouts).