Unlike most other voltage transformers for Japan, PowerBright transformers can be used as either a step up "booster" transformer or a step down "reducer" transformer. This means a PowerBright transformer will work whether you're bringing a North American 120 volt appliance to Japan, or bringing a 100 volt Japanese appliance to North America. Simply select the input voltage coming from the wall outlet via a jumper on the back of the unit, and plug your appliance into the outlet on the front of the unit which matches your appliance's required input voltage.
