[After Sale Service] Refer to the instructions for the installation. Clean the screen and ensure it is dust-free, align the product to screen, gently press over on the frame to remove the bubbles and let the silicone adhered to the frame. in case of any question or problem, please contact the seller without any hesitation to solve until satisfaction. We provide 100% no risk, worry-free after sale service for all FILMEXT Screen Protector. Blue light screen protector for surface laptop 5/4/3/2/1 th 13.5 inch workable for short-sighted people, students, office workers, social media addicts, online gamers, fashion lovers, etc. [What's in Box] surface Laptop 5/4/3/2/1 13.5 in Anti-blue light filter ×1pcs, microfiber cleaning cloth×1pcs, installation cleaning kit×1set. Blue light screen protector installation Guide×1pcs. [Bubble Free Installation] The surface laptop screen protector with latest black frame silicone seal design, easy to install and remove, 100% bubble-free. The blue screen protector for Microsoft Surface Laptop 5/4/3/2/1 13.5 inch with fingerprint resistance, and excellent touching sensibility. [FILMEXT 69.7% Anti-Blue Light Blocking Filter] for Surface Laptop 5/4/3/2/1 13.5 inch 69.7% blue light blocking filter blocks the harmful blue light between 380nm~495nm from the wave range of visible lights, blue light reaches the retina with strong energy. This filter reduces digital eye strain when viewing screens and gives you a better sleeping. Compatible Surface Laptop 4/3/2/1 13.5 inch.