massmall 40x25mm Illuminated Jewelers Eye Loupe LED Uv Lens Jewelry Loupe Magnifier (Led Currency Detecting/Jewelry Identifying Type) 1.With light source Battery switch ,can be used under insufficient sunlight or dark environment. Transducer between currency detecting lamp and LED lamp 2.Magnification: 40x 3.Lens Diameter: 25mm 4.Push switch to Turn ON OFF ON 5.illumination: LED Light uses, with currency detection function lamp, 3 LR1130 batteries ( Batteries included)