Batteries: 3 * LR1130 (included). Voltage: 1.5V. Objective diameter: 25 mm. Magnification: 40 times Weight: 158 g Suitable for: Industrial Purposes, Medical Sciences, Coins and Postage Stamps, Geography, PCB and Printing Industries, Home and Office. The package includes: 1 * magnifying glass, 3 * battery Powerful 40X magnification: The LED jewellers loupe has great magnification power, so you can get an extremely close view of the tiniest details. And gives you a distortion free magnification. It's great for the watch making industry, for inspecting tiny objects, reading small text or for inspecting gems and diamonds. High grade product of lighting: Even in the darkness, Delixike jewelry magnifying glass with LED and LV light could give you a brings crystal clear image, always provides you sharp and clean image. The light also can identify the currency detecting and jewelry. It requires 3 batteries (Batteries are Included). Portable design: Just pull out the jewelry magnifier to use, and put it back to the storage case when not In Use. The storage box will help you to put out your document jewellers magnifier eye glass into your pocket or anywhere and save your space. Widely used: This eye loupe is great for rock collectors, coin collectors, jewelers, hobbyists, industrial purpose, and also makes a great gift for the kids to explore the fabulous tiny world. The whole Magnifier use optical magnifying glass lens and full metal shell, which can make this magnifying lens and light more sturdy, compact and useful.