STEP 1: Determine the voltage rating of your item.
If it's 100–240V, it's dual voltage and doesn't need a voltage converter.
If it's 110–125V, you need a step-down converter. If it's 220–240V, you need a step-up converter.
STEP 2: Determine the wattage of your item.
Look for the wattage or amperage rating on the specification sheet of your item. Calculate the wattage if necessary (W = V × A).
STEP 3: Purchase the correct size voltage transformer.
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