ITEM NAME:4Pcs 12V 30Amp 30A Heavy Duty LED OFF/ON Rocker Switch Car Boat Marine #s Product Description Description: Description: Rating: 12V/DC. 30A. 3 PINS WITH LED lamp , ON /OFF SPST THE fluorescent lamp 's WILL TURN ON WHEN YOU TURN ON THE SWITCH. Feature: Easy setup. 31mm x 19mm  hole, 12mm diameter cut size for the tighten screw  is required and the switch will sit in nicely; don't need to cut outs. The switch comes with a keyhole slot to prevent unwanted rotation. Blue fluorescent lamp 's will be lighted up when the switch is turned on. 2 pole design (On/Off) , 3rd poles with LED to be connected to earth. Earth connect to power(-);Load connect to power(+);the middle connect to the light(+) Main technical characteristics: Name: ASW-20D free.Feature: Easy setup. 2 pole design (On/Off), 3rd poles with LED to be connected to earth. Blue fluorescent lamp 's will be lighted up when the switch is turned on. THE fluorescent lamp 's WILL TURN ON WHEN YOU TURN ON THE SWITCH.