There are two kinds of devices. There is a plug adapter, a simple, inexpensive mechanical device that fits into European wall receptacles and accepts two bladed American plugs. They do not change the voltage but many low wattage devices, like cell phones and laptop chargers, accept 100-240V AC.
Look on the charger. If they do, a simple plug adapter is all you need.
You can get them from a variety of places (REI, here, ACE hardware). For heating devices, a few have a voltage switches, from 110V to 240V.
Voltage Converter Information, read about 110 to 220 converters, 220 to 110 converters, step up and step down voltage converters, foreign plugs and travel plug adapters. JavaScript seems to be disabled in your browser. That way, you can run several devices off one socket and not need several conversion/adapters. – therobyouknow Mar 11 '13 at 13:17 I've made adapters myself by replacing the connector on a power strip.
If not, you will need a voltage converter. These chop off the tops of the sine waves. They produce a wave form unsuitable for low wattage electronic device, like laptop chargers, they can damage them, but they can be used for things like hair dryers. I wouldn't carry a universal plug adapter for every country in the world. You can get a 'So.
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Europe' one at ACE for about $5. That configuration, called a 'Europlug', with 5/32' pins, works everywhere in Europe. Brigette, To begin with it's important to clarify the terminology. A Converter (aka Voltage Converter) reduces the 220-VAC used in European electrical systems to 115-VAC.
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This is essential for devices that are designed only for 115-VAC. It's VERY important to note that there are two principles of conversion used in these devices. One type uses a Transformer, and this should be used with electronic products such as Cell Phone and Camera Chargers. The other type uses solid-state conversion, and this should be used with high-wattage heating appliances such as Hair Dryers. You will most certainly need Plug Adapters which are a simple mechanical device which 'adapts' the various styles of European outlets to allow North American-style plugs to connect.