Premium quality, good ideal for the watch jewelry,or for reading .40 times magnification Lens loupe made of optical glass Switch on/ off for bright white LED light You can get an extremely close view of the tiniest details, Foldable design for your convenient carrying Great tool for appraise jewelry, coins, stamps and antiques etc .Magnification: 40x Lens Diameter: 25mm Illumination: LED light Light powered by 3 LR927 batteries.