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Re: effing doorknob!
If you have 2 pairs of wires, one is most likely from the button by the door, and the other one is to the doorbell transformer, which usually lives in the garage or attic.
If you have a voltmeter, set it for AC volts and test each pair of wires. One of them should have something like 12-20 volts on it. This is the power from the transformer.
Once you have that one figured out, set the meter for the ohms setting, and connect it to the other pair of wires. These should be leading to the button. Have someone press the button while you watch the meter, your reading should change drastically when the button is pressed.
Now that you know which wires go where, hooking the thing up gets easy. Connect one side of the button to the "FRONT" screw. Then, hook one of the transformer wires to the "TRANS" screw. The colors don't matter since it's AC, there is no polarity. You should now have two wires (one from each pair) still unconnected. Twist those together with a wire nut or electrical tape.
Test the doorbell. Should work just fine.