About this itemUniversally Compatible with all 20",21.5",22" monitors, this versatile blue light protector for computer monitors is engineered to be ideally compatible with HP, Samsung, Dell, Lenovo, Acer, Asus, LG, ViewSonic, and other monitor brands. It is even removable and reusable if you buy a new monitor.Blue Light Filter cuts 101% of VHF Blue Light! Blue Light carries the High Energy Visible Light(HEVL) which cannot be absorbed by the cornea and crystalline lens and directly affects the retina and results in significant damage to the eyes.Extend Monitor Longevity by protecting your screen from scratches and dirt. Acting as an outer layer on your monitor, our anti blue light screen protector keeps it free of dust. It comes with its own soft microfiber cleaning wipe.The blue screen protector for computer can cut most of the harmful blue light.Reduce eyestrain and headache.Give you a better sleeping.Anti-Blue Light blocking between 380nm~497nm for wide range HEV protection.Mounts Easily in seconds without tools or hardware. After cleaning your monitor, peel the matte protective film away from both sides of the blue light screen protector. Then position the turned edge over the monitor top.