Buying from craigslist , help :)

New question. So I bought a mouse today and on the bottom it has a switch, if switch is turned up it's at 250 Hz, when it's turned down it's at 500Hz. What's that for?
 
Sorry, I guess I should have been less vague. Why would I ever wanna turn it down to 250? any kind of pro to that or should I just always leave it on 500?
 
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