Compatibility: Kindly note this blue light filter is ONLY compatible with 15.6” PC laptops and notebooks screen or touchscreen display 16:9. | Blue Light Blocking: The anti blue light laptop screen protector can block 90% blue ray between 380nm to 495nm for wide range HEV protection. | Anti-Scratch: With 5H hardness and through special process, the screen protector is with superior performance to prevent scratch. | No Residue Left: No residue leaves on your LCD/LED display when you remove it. | Easy to Install. Follow the included APPLICATION STEPS/TIPS and you will get the perfect effect.