CooSkin Blue Light Proof Screen Protector Film for Laptop 15.6 inch(345mm&times;194mm),Especially for Children,Teenager, Protect Their Eyes CONTENT---This kit features 1x Blue Light screen protectors and 1X Clear screen film(for test) along with a set of microfiber cleaning cloth and Card,2x cleaning sticker. BLUE LIGHT PROOF---Blue Light proof technology deflects harmful blue-violet light & UV away from your eyes while allowing beneficial light to pass through. MATERIAL---Designed with High Quality PET film imported from Japan that consists of multiple layers. Each layer provides specific functions that allow the Matte Anti-Glare line of screen protectors to outperform competitor products that use inferior materials and manufacturing processes. INSTALL----The Anti-bubble silicone resin layer is self-adhesive which allows for an easy dry installation - no more hassle from handling spray solution that could potentially leak into the ports of your device and do damage. For optimal effect, install in a lint-free environment. CUSTOMER SERVICE---We can accept all refund based on all reasons. And 1 year quality guaranty.