If you are planning on taking your camera with you while traveling, remember that some countries use different electrical voltage systems. If you try to plug something such as your battery charger into the wall somewhere in Europe it may not work without an adaptor or converter. The plug may fit into the receptacle, but it isn't necessarily converting the power.
Some countries use the same size plugs and receptacles, if they do, you may need a converter. If your plugs don't even fit into the receptacle you will at least need an adaptor.
An adaptor has a set of prongs on it enabling you to plug it into the receptacle, but it won't convert electricity. If your battery charger or other item is 110-240 50/60 cycle then you only need an adaptor. Your electrical devices will have this information printed on them. Make sure you use the proper adaptor and converter for your equipment or you may do serious damage.
You may find yourself needing several versions of adaptors and converters when you travel. An adaptor may cost you about $20.
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