110v~220v mean

what functino does the red switch on a power supply perform?Why is this IMPORTANT

WHAT IS THE MAIN DIFFERENCE BETWEEN FULL,MID-,AND MINI-TOWER CASES WITH DIAGRAMS
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More about 110v 220v mean
  1. Different countries use different voltage supplies. For example, in the US, you would use the 120v position, in most of Europe, I believe you would need the 220v position.
  2. Actually the PSUs with these switches are quite outdated. Don't buy one.
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