The proprietary optical film used in P1500 effectively reduces the harmful rays and protects our eyes. It enhances the general environment where we and our loved ones read and work. P1500 enables you to lead a much more comfortable and healthier lifestyle with its 10 years of anti-glare technology. Features: 1)Anti-glare with3M?s patented Polarizing light technology， 2)3 Brightness adjustment- 1000 > 700 > 250， 3)5-Level LED color change from daylight to warm-for desired atmosphere， 4)3 Timer setting for auto-off function. Can be set at 30 minutes， 1 hour or 2 hours， 5)Electromagnetic wave appropriateness registration product-This product passed the testing organization designated by the National Electromagnetic Wave Research Center.12cmX12cmX43cm， 0.9kg.