This self powered timing light, with a unique lightweight design, uses two D cell batteries and a xenon bulb to generate a strobe that is visible in broad daylight! It comes with a clip-on inductive pick-up with a 48" lead. The timing light is made of impact resistant plastic with the lens encased in a flexible rubber nose, for exceptional durability and reliability in the shop or at the track. It weighs just 18 ounces, and works great on ALL ignition systems.