The Carson PO-55 is a compact pop-up pocket magnifier with 5x magnification and LED lights that you can easily slide in and out. The universal magnifier fits effortlessly into your bag, breast pocket, and even your wallet. This makes the LED magnifier a useful accessory in any conceivable situation. The lens measures 40 mm in length and is made of aspheric acrylic. Aspheric lenses provide clear, sharp images with minimal distortion at the edges. The pocket magnifier can be used for any imaginable application. Whether you are examining coins or diamonds, observing insects, or simply reading a book in low light, this compact LED magnifier is always handy. If you want to use the magnifier's lighting, you need to insert three AAA batteries (not included) into the compartment. By moving the body upward, you can use the magnifier with illumination. By moving the body downward, you can safely conceal the magnifier behind the plastic housing.