At FORITO, we are committed to creating great products by good quality, friendly, responsive service.*****Full Protection Solution from FORITO -A professional manufacturer *****[Why You need to block blue light] Blue light is comprised of very high energy and a low wavelength very similarly to UV light. The computer is one of an electronic device which gives off large quantities of blue light. It's believed to cause eye fatigue/ myopia, even cause retinal damage after cataract surgery, blurred vision, visual fatigue caused by VDT syndrome, also making your skin produce Chloasma, freckle[6 Layer Protection of product] ? Anti Glare Screen protector ? Anti-static Screen protector ? Anti-scratch Screen protector ? UV400 protection Screen protector ? Radiation Protection Screen protector ? Relieve the fatigue of eyes Screen protector[Compatible with]Compatible with 27 inch Apple imac laptop, Measured Viewable Display Area Diagonally, Corner to Corner Without the Frame -THIS MEASUREMENT IS CRITICAL[How to use] 1.Make sure to clean the screen thoroughly with the included wet & dry wipes 2.Peel off one side of Tab 1, not two much about 2 inches (50 mm) 3.Slowly peel off Tab 1 while adhering the protector with application card from one side 4.Use the Application Card to press out the air bubbles if there is 5.Peel off Tab 2 and you are DONE![FORITO lifetime replacement warranty] We will send you replacements free of charge for: -Installation problem -Does not fit your device -Damaged screen protectors, such as delivery damage