?Lifetime Replacement Guarantee?– If you are not satisfied with anything, we will send you a new screen at absolutely no charge and you do not have to send the product back. We are committed to providing you with a healthier and more efficient service!. ?Ideally Compatible with ZERO-FRAME Monitor?Blue light filter for "frameless" monitors - 16:9 aspect ratio. Width: 21 1/32" (534 mm), Height: 11 27/32" (301 mm), Diagonal: 23.8" (604.5 mm). 23.8 inch Blue light screen protector is engineered to be compatible with HP, Dell, Samsung, Lenovo, LG, Acer, ASUS, ViewSonic, and other monitor brands. Please verify your computer screen's width and height measurements before ordering. ?Easy to Install?- Our blue light screen protector can be completed in about 30 seconds. The blue screen protector installation has been completely upgraded, no more plastic tabs or tape to hold the blue screen protector in place. Forget about leaving sticky residue when you pull it off and have a different mood with PYS' new blue light screen protector. ?True Colors & High Light Transmission?- The blue light monitor screen protector has a light transmittance of 96%, and will not cause any burden on your computer. PYS protects your eyes and sleep, but still allows non-harmful light through the screen, meaning no retro orange tinge - just a full colour crystal clear screen.So now you can enjoy the high-definition screen to do any work. ?Life Saver for Your Eyes?Improve sleep, protect eyes and skin from harmful blue light. Blue light screen protector is a absolutely excellent blue light blocking screen protector, effectively blocking blue light =90%, UV blocking =98%,blocks other harmful lights =99%.At the same time, it is also anti-glare, prevents digital eye strain and headaches.