FAST CHARGE TECHNOLOGY & 10 ULTRA BRIGHT LEDs: Recharge in just 2 hours with included Micro USB cable, Up to 12 hours (Medium-Brightness mode) of powerful, non-diminishing brightness from the included premium rechargeable 700 mAh battery. Our LEDs boast an extended 100,000-hour lifespan which is equivalent to 20 ye without burning out or overheating. CRYSTAL CLEAR ACRYLIC LENS: Made out of optical grade acrylic which is lighter and more scratch-resistant & shatterproof than glass while provides the same clarity level. Magnifies up to 4x(400%) without optical distortion. Optimal to enhance reading and viewing very fine details in books, newspapers, magazines, phgraphs, maps, electronics, miniatures, jewelry, pill bottles, medications, hobbies, models, and crafts of all kinds.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.