The carson po-55 is a compact pop-up pocket magnifier with a 5x magnification and led lights, which you can easily slide in and out the housing. this universal loupe easily fits in your pocket, chest pocket and even wallet. this makes this led magnifier the accessory that comes in handy in every conceivable situation. The length of the lens is 40mm and is made of aspheric acrylic. aspherical lenses provide clear, sharp images and have minimal distortion at the edges. Usage carson po-55 The pocket loupe can be used for every conceivable application. whether you want to observe coins or diamonds, look at insects or just read a book, in either high or low light: this compact led magnifier is always useful! If you want to use the magnifier's lighting, you need to put three aaa batteries (not included) in the compartment. by moving the body upwards, you can use the magnifier with lighting. by moving the body downwards you can safely hide the magnifier behind the plastic housing.