LRX-200LEDNB Large Rectangular reading magnifier with LED illumination and a 3x aspheric lens without a bifocal. I non bifocal lens is best for a dedicated reading magnifier because some people sense bifocal can obscure the field of view and get in the way, a rectangular shape gives a wider field of view for less stressful easier reading. The "Ambidextrous" LED illumination 2" x 4" 3x aspheric main lens is easy to focus and wide viewing area makes this an ideal reading and inspection and scanning magnifier. This is also useful for those with early to mid stage AMD Macular Degeneration. The LRX-200 is a very durable magnifier, we have been making this model for over 35 yrs with continual improvements to make it more durable and useful.This Magnifier has an aspheric lens that provides a powerful 3x where all other lighted 2"x4" magnifiers have 2x-2.5x. Uses two "AA" batteries. Made In The USA