The HELLA Flush-Mount Rocker Switch lights up when the switch is in the "On" position. This switch is available in various colors to help distinguish between applications. The HELLA flush-mount switch mounts in a round hole and includes three terminal connections. This rocker has a max load of 12V/20A, three 3/16-inch blade terminal connections, and measures 3/4 x 1-3/16 inches (WxH) at the switch base.