Use this flasher on top of your diesel, roadway warning lights, tower signals, emergency vehicles, etc. The amber L.E.D. (3mm) mimics a real flashing light. If you choose to use this product as a rooftop beacon, we have included a lens cap that will diffuse the light. Simply drill an 11/64″ hole, the lens cap will snap into the hole, and the L.E.D. will snap into the lens.