Check your appliance for dual-voltage capability. Some appliances sold in the U.S. can accommodate the 220-volt system without an adapter or transformer. Appliances that are marked 100V~240V have dual voltage and can handle foreign electrical systems.
Determine your electrical limits. You will need more than a single adapter plug if you have several electrical items. Choose your transformer or converter based on the amount of wattage your appliances need. Pick a transformer or converter that can accommodate the item needing the most wattage.
Buy with your destination's electrical systems in mind. You may still need a plug after buying an adapter. Search for a plug that is guaranteed to work in the country you plan to visit. Read the packaging for this information.
Go to retailers who cater to travelers for the best selection and deals. These may include large travel centers or stores that specialize in electrical equipment for travel. Compare prices at the travel store with the big-box retailers and online stores. Be sure to compare systems with the same features.
Contact your destination to confirm your choice. Call the concierge at the hotel where you intend to stay for confirmation of the plug type and voltage load of the electrical system in the area. This is the best way to ensure that you have the right equipment before you leave town.