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<p>Different countries use power supplies at different voltages (usually 110V
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or 220-240V) and AC frequencies (usually 50 Hz or 60 Hz). Your computer should
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an appropriate power adapter. You may also need to flip a switch.</p>
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<p>If you have a laptop, all you should need to do is get the right plug for
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their adapter, so you may already have the right one. If not, plugging your
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existing one into a standard travel adapter will suffice.</p>