Brilliant LED: With this dual LED light source, you can clearly see the objects in the dark or low light condition. The magnifier provides a detector to detect counterfeit banknotes, which is used for banknotes, passports, credit cards and travelers checks, etc. Pocket Size: It is very convenient to carry and you can use it anywhere. It requires 3 LR1130 batteries (batteries are included). Function: The eye magnifier is great for rock collectors, coin collectors, jewelers, hobbyists, and also makes a great gift for kids to explore the fabulous little world. Foldable Design: Just pull out the jewelry magnifier to use it and put it back when not in use. This 40X Magnifying Lighted Jeweler's Magnifier is made of durable metal with 25mm length optical glass and bright dual LED light. Specifications: full metal battery powered protect the case Industrial use (watchmaking, jewelers) Medical science Coins and stamp collectors Geography Printed circuit board and printing industry Gardening Education Home and offices Features Powered by LR1130 batteries and easy to replace comes with a nice gift box and a plastic carrying case. Mini size with 40x 25mm lens easy to carry and make the little details in your life clearer