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10,000 Watt Maximum Capacity Heavy-Duty Continuous Use Transformer. Converts single phase 220/240 Volts down to 110/120 Volts. Compatible with both 50Hz and 60Hz. A step down transformer also known as 220 voltage converter is required when you want to use 110 volt USA products in other countries where the voltage ranges from 220 Volt - 240 Volt. Remember to leave at least a 100% margin for power surges/spike when buying a transformer. Some items, such as televisions and computer monitors spike when you turn them on. For these products you need to buy a voltage converter transformer that is at least 3 times the items capacity. For power tools, laser printers and heating appliances like coffee makers, toasters, microwaves, lasers, halogen or fluorescent bulbs you must leave a margin of 4 times. It doesn't hurt to buy a transformer that is rated much higher than listed watts on your device.