mine says 100V 50-60Hz I bought it in Japan and using in Eurtope with 220/240VAC
I was really afraid before trying. but i managed thanks to this guide and willing to play!! it works! it is definetly dual voltage.
they make them all the same, i guess in the same factory in China, i am wondering about the Blue ray disc, does the region depends by the hardware or the software (i guess the second one) i haven't tryed it yet