Nitecore MT1U Multi-Task Professional 365nm 3W Ultraviolet Blacklight LED Flashlight w/ 2x LumenTac CR123A Batteries & Organizer A lightweight, portable handheld 3 watt ultraviolet flashlight that emits a powerful UV beam at 365nm wavelength and 900mW radiant power For use in professional capacities such as detecting counterfeit documents, money verification, forensic science, gasoline inspection, amber and jewelry detection, body fluid and urine detection and fluorescence activation For use in hunting capacities such as attracting certain breeds of fish or hunting scorpions and tracking other creatures. Driven by a single 18650 rechargeable Li-ion battery for a runtime up to four hours or 2x CR123A's. Comes with a Nitecore holster and lanyard as well as 2x LumenTac CR123A batteries as well as a battery organizer capable or holding 2x 18650 batteries or 4x CR123A Batteries