Converter vs Adapter

If you plug an appliance designed only to work on a 110v 60Hz supply into a 220v/240v 50Hz supply without a converter it is highly likely that you'll damage it.

However, many modern appliances (and most electronics like computers, phones, etc) have power supplies designed to work on both systems and require only an adaptor for the local sockets. You should check the appliances you intend to use carefully for their rated voltages.

If you're only planning to use a hair dryer or similar appliance it might be cost effective to buy a European standard appliance when you arrive.

Here is the Difference between a travel converter and adapter:

Travel Adapter

Travel electrical adapters (as seen here) only "adapt" the plug to fit European electrical outlets. They usually convert the american flat prong plug into a European round pronged plug. So, while it will make your plug "fit" the European outlet, it will not affect the voltage. So if your appliance is only rated for 120V (American standard voltage), there is a good chance your appliance will get fried. However if your appliance is rated for both american and European voltages, usually notated by "120V-240V" on the appliance's label, it will work properly.

Travel Converter

A travel electrical converter (the item you linked to) is designed to actually convert the voltage to the American voltage standard. They do this via a built in transformer that reduces the actual voltage throughput to 120V. It is safe to used such a converter with your american appliances, as long as it is capable of putting out the amount of wattage your appliance needs. Look for the "Output Wattage" on the converters label, and compare it to the required wattage on your appliances label.

Note: A lot of converters go under the name adapters, and vice versa. Make sure to read the actual product description to make sure you are getting what you need.

Correct. As a matter of fact, it states this in the product description:

ADAPTER MODE: Only use Adapter Mode for DUAL VOLTAGE (110-220V, 120-240V) devices, such as iPhone charger, iPad charger, Laptop, MAC, Dual Voltage Hair straightener and other Dual Voltage Appliances. Dual voltage appliances must be used adapter mode.

For what people generally call appliances rather than electronics, such as those used for cooking, cleaning and heating, the appliance would most likely be seriously damaged by the higher voltage.

Oh dear! What a lot of confusion!

There are five issues involved: 1. The physical shape of the outlets -- relatively easy to adapt standard American NEMA plugs to fit outlets in many other countries.

2. The voltage involved -- most countries use 230 volt AC supplies rather than US 110-120 volt AC supplies. Converters MAY contain a small transformer, but most use an electronic method of providing a supply which SOME appliances may work off but others won't, or will be damaged by.

3. Frequency -- US mains supply is 60Hz (60 c/s) whereas most of the world uses 50Hz frequency. US appliances, including many hairdryers, are marked AC ONLY and such appliances do not usually work effectively on 50HZ supplies.

4. Most small electronic appliances have power supplies which will work effectively on any AC voltage from 100v to 250v, so all you need for your small electronic gadgets is an adaptor to fit the outlets in the country you're visiting.

5. Many new outlets in some countries have a built-in USB power supply so all you need in that instance is a USB cable. USB outlets provide the same voltage worldwide.

If you really MUST have a hairdryer, buy one in your destination country. In any case, most hotels will have a hairdryer, probably hard wired into the wall.