VCT VT-1000J - Japanese Step Up/Down Voltage Transformer Converts Japan 100 Volts To 120Volts OR Vice Versa -1000 Watt This continuous use transformer is capable of both up and down voltage conversions for Japan and USA electricity to enable use of Japanese products in USA and USA products in Japan 1000 Watts is the maximum capacity of this transformer including the power surge It converts 110/120 volt USA power to 100 volt Japan power AND 100 volt to 110/120 volts (means it will convert the American power to Japanese power and also convert Japanese power to American) Power ON/OFF Switch. Fuse protection for safety Remember to leave at least a 100% margin for power surges/spike when buying a transformer. For power tools, laser printers and heating appliances like Rice cookers, coffee makers, toasters, halogen or fluorescent bulbs you must leave a power spike margin of 4 times