Battery: 3*LR1130 (included). Voltage: 1.5V Lens Diameter: 25mm Magnification: 40x Weight: 158g Suitable for: Industrial Purposes, Medical Sciences, Coins and Stamps, Geography, Circuit Board and Printing Industry, Home and Office. The package includes: 1 * magnifying glass, 3 * battery POWERFUL 40X MAGNIFICATION - The LED and UV jeweler magnifier features powerful magnification so you can take a close look at the smallest details. The magnifying glass provides distortion-free magnification. It is ideal for the watch industry, investigating small objects, reading small text or checking gems and diamonds. PRODUCT WITH HIGH QUALITY LIGHTING - Even in the dark, Jewelry Magnifier with LED and UV light can give you a crystal clear sharp image. The UV light can also detect currency and identify the jewellery. It requires 3 LR927 batteries (batteries are included). Portable design: just slide out the jewelry magnifier to use, and slide it back into the case when not in use. The storage case allows you to put the magnifier in your bag or anywhere else and save space. MULTI-PURPOSE - The eye magnifier is great for stone and coin collectors, jewelers, hobbyists, industrial use, and also as a great gift for kids to explore the fabulous tiny world. The eye magnifier is made of optical magnifying glass and full metal housing, which makes it lighter, more stable, compact and useful.