Single phase 750 Watt Maximum output Step Up/Down Voltage Converter Transformer to convert AC 110-120 volts to AC 220-240 volts or AC 220-240 volts to AC 110-120 volts. It has heavy duty industrial cord with USA Grounded plug on cord. It is easy to use, safe and reliable and can be use continously 24/7. To select the voltage converter transformer, we recommend at least 50% higher wattage transformer than your equipment's required wattage. For example: A 500 Watt appliance should be used with a transformer of at least 750 Watts.