Internal ?+ -? switch on the Bluetooth mouse ?

in Current Mac Hardware edited January 2014
Why is there is an internal switch above the sensor visable when you remove the battery cover? I was on the phone w/ Apple support on an unrelated issue and the guy said so I can put the batteries in the opposite way. I?m not kidding ? I wish I was.

I?ve tried it both ways and can see no discernable difference

Oh, and I cannot find a manual online or on my computer to explain this.
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