Material: durable hard ABS and optical glass lens. Magnification: 40X. size: about 120 x 32 x 36 mm; Lens effective diameter: about 19.5mm. | High quality material, durable enough for your daily using. Easy to replace batteries. Super light weighted. | Can be used for close inspection of items like map, circuit boards, hallmarks, stamps, coin collectors, hobbyists and collectors of Antique Styles | 3 * AAA batteries (not included). | please absolutely do not see the direct sunshine through the lens because it may scald your eyes. Under sunshine,please do not put it at window or at the focus of combustibles