[COMPATIBILITY] This anti blue light screen protector laptop fits the laptop screen that's 15.6 in (aspect ratio 16:9); filter size (W x H): 13.6 in (345mm) x 7.6 in (194mm). [ANTI BLUE LIGHT] With an anti-glare, PYS blue light screen protector laptop blocks out around 90% of the harmful light, reducing the possibility of eye fatigue, computer vision syndrome (CVS) and other damages to your eyes. [SCRATCH RESISTANCE] After special treatment, PYS anti glare screen protector laptop has a hardness of 5H and performs well in anti-scratch. [PEOPLE WHO NEED IT] Perfect for short-sighted person, school student, office worker, social media addict, online gamer, fashion lover, etc. [HOW TO INSTALL] Check out if it fits the screen of your device; clean the screen with the alcohol wipe, use the microfiber cloth to wipe it clean, and get rid of any remaining dust particles with a dust-removing tape; peel off layer #1 from the screen protector and apply; use the hard card to remove any remaining bubbles; peel off layer #2 from the screen protector, then the installation is complete.