This kind of products is designed for the electrical appliances with voltage of AC 110/220V used in the area of AC/220/240v, or 220/240v voltage used in the area of AC 110/120v, they are for use with all electronic and electrical equipment( up to rated wattage).
300 Step Down Voltage transformer is easy to operate, by simply plugging the converter into the 220 volt outlet and then plugging your 110 volt equipment directly into the converter.