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Do you need a transformer to travel to the United States with domestic mobile phones and computers?

Whether it is necessary to use a transformer to travel to the United States to use domestic mobile phones and computers depends on the specific electrical equipment. Generally speaking, the voltage standard of most equipment is 100 volts to 240 volts, which can be used directly in the United States without using a transformer. However, some special equipment, such as electric heaters, ovens and other high-power equipment, may require additional conversion equipment.

In addition, if the rated voltage of your equipment is inconsistent with the American voltage standard, you may need to use a transformer to use these equipment abroad. Therefore, it is recommended to check your electrical equipment before you leave, and find out its voltage standard and required conversion equipment.

In short, if you are not sure whether your equipment needs a transformer, you'd better consult the manufacturer or the local power company.