The standard voltage transformers from LiteFuzeVoltageConverters are designed for continuous use. These dual way voltage transformers can convert voltage from 110/120 V to 220/240 V and 220/240V to 110/120V to meet all your individual needs. The step up and step down voltage transformer features an input voltage selection switch in the rear of the transformer. Select the input voltage according to the country's voltage and the transformer will output the opposite voltage. For example, when using it in 220V countries, select 220V on the transformer and the output will be 110V which will allow you to use the 110V electronics and appliances. Refer to our voltage converter guide or call us, if you need help selecting the right size voltage transformer. We recommend at least 50% higher wattage transformer than your equipment's required wattage. Also, view our voltage converter comparison chart to compare features of all the types of transformer we carry.