SecurityIng&reg; Mini 501B Purple Light Bulb LED Blacklight Flashlight Torch Powered by 1 x 3.7V 18650 Rechargeable Battery for Money Detector, Leak detector Cat-Dog-Pet Urine (Battery Not Included) Comes with imported high-power LED light, and its working life can be 100 thousand hours. It is much more convenient to use it when doing the inspection. Also designed to mount on certain hand pistols, rifles and shotguns with proper mounting equipment. This UV flashlight can be used to detect counterfeiting money, counterfeit cigarettes,etc. Power Source: 1 x 18650 3.7V Rechargeable Battery. (Not Included)