Privacy screen uses a microlouver technology that darkens the screen view from the sides (+/- 30 degrees from center) - Designed to fit laptops with 13.5" displays and 3:2 aspect ratio; Does not interfere when closing the lid - Flip-Over mounting feature enables quickly flip-over the privacy filter to share contents without uninstalling the filter - This laptop privacy screen blocks up to 51% of blue light - Use the included adhesive strips or flip-over tabs to install the screen protector