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These chrome-plated metal buttons are rugged and waterproof and look real good while doing it! Simply drill a 16mm hole into any material up to 10mm thick and you can fit these in place, there's even a rubber gasket to keep any water out of the enclosure. On the front of the button is a flat metal actuator, surrounded by a blue plastic LED ring. On the back there are 2 contacts for the button (common, normal-open) and 2 for the red LED ring (+ and -). Connect 3 to 12V to the LED to have it light up nicely, there's a built in resistor!This button is a momentary push button, when you press it the 'normal-open' contact shorts to the common contact. When you release it, the contacts open up again.The switch and LED are separated, so you could wire it to turn on when pressed or vice versa or whatever you wish!