Bright LED and UV Light: You can see objects clearly in dark or insufficient light conditions with this dual LED light source. The UV light works as a counterfeit detector for things such as the paper currency, passports, Credit cards, and traveler's checks etcPocket size:it is very convenient to carry and you can use it anywhere. It requires 3 LR1130 batteries (Batteries are Included).Function:eye loupe is great for rock collectors, coin collectors, jewelers, hobbyists, and also makes a great gift for the kids to explore the fabulous tiny world.Foldable Design:Just Pull Out the Jewelry Magnifier to Use, and Put It Back When Not In Use.This 40X magnifying glass Jeweler Loupe is built from durable metal with an optical glass that is 25 mm in length and has a dual bright LED light.