Using this white and clear illuminated toggle switch is easy. First, decide how you want to use it. If you want to control an accessory, use the toggle to connect and disconnect the two pins on the bottom. For the LED, you have options. To keep it always on, provide 3 - 12V between the ground and headlamp pin. If you want it on only when the switch is connected, supply 3 - 12V on the (+) pin and connect the ground to the ground pin. Remember, the rated voltage is 12V max for the switch, and the LED lights up at 3V. Although it says '20 A' on the side, we recommend using a maximum of 1 - 2A to avoid any issues. When it comes to the protective cover, you can leave it on. It'll automatically turn the switch off when flipped closed. But if you don't need it, just remove it. There's no special maintenance required for this switch. Just keep it clean and dry to ensure it works well for a long time.