YOCTOSUN Head Mount Magnifier with 2 Led Professional Jeweler's Loupe Light Bracket and Headband are Interchangeable 5 interchangeable lenses with 1.0X, 1.5X, 2.0X, 2.5X, 3.5X magnification, scratch-resistant acrylic reduces weight. Comfortable eyeglass frame with rubber nose-pads or switch to headband for more-secure fit. Headlight with 2 super-bright LED -powered by 3 AAA batteries (included), last for long hours. See your work pieces or text magnified up to 350% original size with high clarity. Perfect for jewelry work, watch repair, arts & crafts or as general reading aid. 1.0X, 1.5X, 2.0X, 2.5X and 3.5X magnification power 5 Detachable magnifying lenses Frames Size 8-3/4&#034; X 5-11/16&#034; X 2-1/2&#034; Angle of light can be adjusted vertically Adjustable head strap (can be attached) 2 bright LED lights Requires three AAA batteries (included) Storage case for the lenses Cleaning Cloth Can be used as a headlamp The product item box is unsealed Focal Length of 5 Lenses: 21&#034; (1.0X), 15&#034; (1.5X), 10-1/2&#034; (2.0X), 7&#034; (2.5X), 6&#034; (3.5X) Size of Single Lens: 3-3/4&#034; X 1-5/16&#034; Magnifer with bracket /1.95oz (without lenses) Magnifier with headband/ 2.19oz (without lenses) 3.5X lens/0.86oz ,2.5X lens/0.68oz ,2.0X lens /0.57oz ,1.5X lens/0.52oz,1.0X lens/0.46oz 3AAA batteries/ 0.76oz