This converter have a step-up&down transformer that convert AC voltage. Using it to convert the multi-kind net voltage into general output under which all the electronic equipment's are in safe operation. This Power Transformer can be used in 110 volt countries and 220 volt countries. This will convert from 220/240 volt to 110/120 volt and from 110/120 volt to 220/240 volt. Its default mode is 220v in to 110V