Seven Star 50W Step UP Transformer 110V-220V Converter SS214 (USA PIN). For use in the U.S.A. Check the watts on your equipment to make sure you are not exceeding the max watts of the converter. Please remember to multiply the watts consumption of your equipment by 2-5 times to account for voltage spikes when you first turn the equipment on. Make sure the wattage and voltage of your appliance or equipment and the wattage of the transformer are suitable for your appliances or equipment before you connect the transformer.