Features: Waterproof 12VDC lighted rocker switch is a miniature rocker switch. Available colors of button: black/blue. "O I" marked on the button. Materials: Round Waterproof 12V DC illuminated rocker switch is made of nylon 66 and IP65 material. The terminal is made of brass, silver plated. Function: Waterproof 12 volt marine rocker switch has 3 pins (easy to turn ON/OFF), and SPST (single pole single throw) design with a set of jumpers. The rating is 20A 12VDC. Installation: The mounting hole size of the round rocker switch is 0.787 inches (20mm). The switch has an easy to install snap-in design. Application: The round rocker switch is widely applied to all kinds of household appliances such as water dispenser, treadmill, coffee pot, and so on.