Perfect Design - These switches are designed to connect and disconnect DC12V 20A electrical circuit at will, SPST ON-OFF control, 2-pole design (on/off), 3rd pole with LED connect to ground. Fluorescent lights will be on when the switch is turned on Safety protection - This car switch uses copper plated silver contacts, has good electrical conductivity, and uses materials and flame retardant housing for high safety Easy installation - The pin yellow for light, middle pin for negative (DC) or null (AC) line, rest pin for your gear. Just need a 20mm hole if inserting. The small on/off switch comes with a keyhole slot to prevent unwanted rotation.Widely Used - These LED rocker switches are widely used for kinds of electrical products, cars, boats, household appliances, communication devices, instruments measuring, gas water heater and light decoration etc. 5 random colors - The 12V round switch set comes with 5 random colors, total is 10 pieces.ZF Notice:1. The monitors used are different, the computers are different, and the camera angles are different, there may be problems with the angle and color.2. Purely manual measurement, there may be 0-1cm error. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.