Custom Flashlights & Lanterns, Black Ultraviolet (UV) LED Flashlight - 395nm, Ultraviolet (UV) blacklight for detection of counterfeit bills, credit cards, or identification cards. Night clubs and bars use UV stamps where detection and authenticity is needed. Longwave approximately 395 nanometers. 9 UV LED bulbs. On off button. 3 AAA batteries included & installed. ... #FL211 $4.30/each.