Sea Dog Illuminating Contura Rocker Switch Sea Dog Illuminating Contura Rocker Switch is durable and looks good on any boat. Made from injected molded nylon and stamped brass with silver tin oxide contacts allowing this rocker switch to hold up to harsh marine environments.Stands up to shock, vibration, moisture, salt spray, and thermoshock. Works in temperatures from -40 C up to 85 C. UL1500ISO8846 ignition protection for Marine vessels. When in the on position the switch displays a red light.