hi, i recently moved to south america and i brought with me,my 360.now the electricity here is different(220v)from the us.so i bought those pwer converters.the 360 uses 127v and 203 watts.i bought the converter from 110 to 220 with 500 watts with should be fine ,but the problem is that it comes with the input for only two prongs.the 360 has 3(ground i think its called) so i was wondering if and adaptor would do.im not sure if it might cause a surge.any help would be appreciated thanks!