If you know you're going to have access to an supply, all you need is an adaptor which lets you plug your device into the wall outlet. The adaptor routinely includes a transformer which brings the voltage of the electricity down from the volts down to the level of your device - otherwise, you'd fry the electronics in your device in short order. If you travel outside the country, you need to find a "universal adaptor" for your devices, which will adapt your equipment to the electrical outlets in the countries you're visiting.
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