Not all the UV led are the same. This UV LED flashlight is designed for money checking, creditcard checking, criminalogy, oil-mining, mineralogy, archeology, surveillance, chemical probe testing, security inks, document checking, biology, medical applications, chemistry, food checking, water pollution detection. Finding The Fakes, Frauds & Forgers. As forgers and counterfeiters become more sophisticated, officials are finding new ways to create fraudulent-resistant documents. One of the most effective methods is to imprint hidden ink which is extremely difficult to reproduce and is only detectable by using ultraviolet light. All states will soon incorporate such images in their driver"s licenses. They are also used on credit cards, vehicle registration cards, currencies, checks, and other important documents. ultraviolet lights are also used by medical examiners to quickly detect the presence of proteins at crime scenes. Some other use for this UV LED flashlight Bugs/Insect Detection Minerals Hunting Automobile Air Condition Fluid Leaking (Freon) Police use it for scanning the crime scene Durable - Aluminum, LED are long Life and Unbreakable Strong in UV, but not strong in visible light 1 21-LED UV flashlights in black body finish Specifications: Bulb Type Longwave UV LED, 380-385 nM Bulb Life 100,000 Hours Body Material Aluminum with "O" rings for water resistance Battery Require 3 x AAA Alkaline Battery (Not Included) Battery Life Approximately 20 hours on 3 AAA batteries Switch Type Press on, Press off from rear cap Weight 4 oz. Head Diameter 1.375" 38 mm Body Diameter 1.125" or 27.5 mm Length 3.8" or 94.2 mm