Beileshi 40X Magnifier with LED + UV Illuminated Jeweler Lens Loupe with Metal Construction and Optical Glass Magnifying for Watch Stamps Jeweler Diamond With light source Battery switch ,can be used under insufficient sunlight or dark environment. Transducer between currency detecting lamp and LED lamp Magnification: 40x Lens Diameter: 25mm Push switch to Turn ON OFF ON illumination: LED Light uses, with currency detection function lamp, 3 LR1130 batteries ( Batteries included)