The Konus 3x/5x Aspherical Bifocal Hand Magnifier allows you to clearly see small print and other minute details. Its large primary 3x lens is designed to be aspheric, which presents a very flat field of view, so there is very little curvature at the edges to allow you to use the whole lens to see. Near the top edge is a small 5x spot lens to extra close if you need to. When you need more light than is available, the magnifier has an innovative illumination system: A Cree LED is mounted in a ball switch on the handle that allows you, with one finger, to turn the light on and position it by moving it up or down. The light runs on two included AAA batteries.