The lens system is equipped with an advanced achromatic optical coating that reduces light reflection to 0.3% and enables very bright and clear images with a wide field of view. Height Adjustable-- Compact and stylish design, portable weight, easy to use, 3 moveable joints ensure holder can be stretched to any height according to your needs when as a desktop magnifier. With comfortable ergonomic handle suitable for children, adults, seniors, hobbyists and professionals. Magnification: 2.5X / 3.5X, working distance: 420mm. With filter for light reduction. Handheld or Desktop -- Magnifier glasses can be as a desktop magnifier by stretching its holder and placing it on the desk. It also can be folded to serve as a hand-held magnifier to realize wider application . [4X-32X Zoom]: 4.3 inch big LCD screen and 4X-32X Zoom, making this portable magnifier reading aids with good magnifier effect. But you should