yes it's portugese, roughly says to get the 12v positive from the roof light? then the negative you can probably get from anywhere in the car, connect the positive (i guess) to the switch and you're done, I'll check if I can see how it's installed in my car but yes, apparently you have to run a wire all the way from the roof light (or probably also cigarrette lighter) all the way back to get the 12v positive.