BRIGHT LED and UV LIGHT: You can see objects clearly in dark or insufficient light conditions with this dual LED light source. Has UV light for Counterfeit Identification of Paper Currency, Passports, Paintings, Geology Study. It requires 3 LR1130 batteries (Batteries are Included). 40X HAND LENS: Illuminated jeweler loupe is built from durable metal with an optical grade glass, it has an authentic diopter glass lens that shines daylight bright light without any glare and magnifies up to 40x magnification power with no smearing and blurring on the images. EASY TO CARRY: Weight is only 3.1oz, pocket size, the jewelry eye loop is easy to take no matter where you want to go. Special foldable design, just pull out the jewelry magnifier to use, and put it back when not in use, the cover folds closed to protect the lens and easy carrying. IDEAL GIFT: Loupe is great for geology study, rock collectors, jewelers, hobbyists, crafters, coin collectors, stamp collectors, beading and jewelry making, machine shop tool, electronics and computer repair. Great gifts for students and children they will love discovering the fabulous small world around them. 40X All Metal Jewelers Loupe - LED and UV Illumination 40X Power Magnification - LED and UV Illumination - Only 3.2 oz - Comes with a free case - Replaceable Batteries (3 LR1130) Pre-installed (Loupe is ready to use). It has 40x 25mm lens to help illuminate and magnify fine print and small details, so it's great for repairs or handiwork, crafts, hobbies, fine arts!