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General suggestions or questions about the SparkFun Electronics website
By n1ist
There are two sets of two pins. In each set, they are usually connected together. Normally, you only use one pin (either one) of each set; the choice often depends on which pin is easiest to route to on a PCB. The button, when pressed, connects the two sets together.

To figure out which pins are which, just use an ohmmeter or a lightbulb in series with a battery to make a continuity tester.