The Flaming River Self-Powered Timing Light is designed to work without an auxiliary power source. The battery powered nature makes this timing light ideal for use with magnetos, rear battery mount race cars, motorcycles, marine, go-karts, and all spark ignition systems for hassle-free timing. This timing light is equipped with a xenon bulb that generates a bright timing strobe, as well as doubling as a convenient work light. Two lead options are available to best fit the chosen application.