Simran SM-1000J Step Up and Down Japanese Transformer 1000W; Can be used only in 100 and 120 volt countries; Will convert from 120 volt to 100 volt AND from 100 volt to 120 volt.; Fuse protected; Heavy duty continuous use; Power ON/OFF Switch This transformer is capable of both up/down voltage conversions for Japan/USA Converts from 120 volt to 100 volt &amp; from 100 volt to 120 volts Rated Load: 1000 Watts max including power surge Heavy duty for continuous use. Power ON/OFF Switch. Fuse protected. Leave a 100% margin for power spike when using transformers. For the TVs, Refrigerators, surge margin is 3 times the wattage. Heating appliances, laser printers and power tools require 4 times margin.