Where you're going, and how widely you travel will inform your choice of power adapter. You should also be aware of voltage differences from country to country. Some of your electronic devices may be dual voltage, but it's always wise to double check, so you don't fry your electronics in a country with higher voltage. Read more about voltage and plug adapters versus voltage converters at the bottom of this article. 1. Voltage conversion - may be necessary if your device is not dual voltage. Dual voltage devices will have a label that says something like "100/240V." Devices like hairdryers, flat irons, etc., are generally NOT dual voltage.2. Universal Plug Adapter - these all-in-on devices have a variety of plug prongs that can be configured to fit most international outlets. Even with universal adapters, be sure to check that the adapter will work in the country you'll be traveling to, as very few are truly worldwide travel adapters (for example, universal plug adapters often don't include some South African countries, and other less touristy destinations).3. USB plug - some adapters have a handy USB plug in addition to the regular plug receptacle, so you can leave the plug portion of your phone or iPad charger at home, and charge multiple devices at the same time.4. Compact Size - You don't want a power adapter to take up much space in your luggage. Voltage converters are large by necessity, but it's not difficult to find a wall plug adapter that will fit in the palm of your hand. You may also find that you want multiple plug adapters for all your devices, so large adapters can quickly take up valuable luggage space.