RECTANGULAR SHAPES THE WAY YOU NATURALLY READ: The rectangular lens is especially design to simulate the way we naturally view things from left to right, the magnifying lens covers large viewing area without having your hands move all the time, lens is measured 4.35"x 2.7" and magnifies up to 300%. 3X MAGNIFICATION LENS: Made out of optical grade acrylic which is lighter and more scratch-resistant & shatterproof than glass while provides the same clarity level. The large rectangular main lens can magnify up to 300%. It is perfect for reading/viewing small prints Map, Newspaper, Magazine and also great for eye conditions such as aging eyes and macular degeneration. REDUCE EYE STRAIN & DIMMABLE LIGHTING : This led magnifier is clinically proven to be ideal for anyone who strains their eyes to see words on a page because it magnifies and provides light without glare. The roller dimmer allows you to easily adjust the brightness level(peaks at 600 lumens) with the tap of a finger to achieve the perfect lighting for various tasks. LIGHTWEIGHT & ERGONOMIC HANDLE: Thanks to the special design premium lighter lens it only weighs 6.5oz, in addition, the handle of this LED magnifier is ergonomically designed to grip/hold comfortable for most hands, making it ideal for anyone who loves to read for longer period of time. 10 ENERGY EFFICIENT & LONG LASTING SMD LEDs: Our SMD LEDs are powered by 3 AAA batteries(Not included) and are designed to last more than 100,000 hour. They provide more evenly lit viewing area, our LED lighting will last for more than 20 years without burning out or overheating. Save money and energy while enjoying long lasting bright light.