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