Highlights: Features a TG 1W UV LED emitter 390nm~450nm wavelength (ultraviolet UV)350m A current output digitally regulated driver circuitry Aluminum smooth reflector Completely built & ready to use Drops into Ultrafire C2, WF-502B & flashlights with similar emitter spacing design Voltage input: 3.0V~4.2 V Specification: Dimensions (cm): 2.6 x 2.6 x 3.7 Weight (Kg): 0.0233 Package Contents:1 x Flashlight