STEELMAN PRO 78611 UV Reactive Inspection Pen Light TRUE UV LED - True ultraviolet LED emits 395-405nm wavelength UV light ideal for leak detection and document inspection ANODIZED ALUMINUM - Durable casing is made of black anodized aluminum with a tough polycarbonate lens POCKET CLIP - Includes an attached painted steel pocket clip to easily secure the light onto a pocket or lanyard LONG RUNTIME - Long lasting 4-hour and 30-minute runtime on a fresh set of alkaline batteries WEATHER RESISTANT - Tight fitting components protect against water and dust that could shorten the lifespan of the flashlight INCLUDED BATTERIES - Powered by 2 AAA batteries which come included