The ST500M-X is a 12/24V single flash strobe light with a fresnel lens (polycarbonate), rubber base, potted circuit, and linear strobe bulb (L2-77). It includes a 90 lb magnet, 15' coiled cord and cigarette lighter plug with a built in ON/OFF switch. Replace the "X" in the part # to indicate the lens color required, A-amber, R-red, B-blue, C-clear, or G-green.