Privacy Screen Uses A Microlouver Technology That Darkens The Screen View From The Sides (+ / - 30 Degrees From Center) - Fits Laptops With 13.3" Displays And 16:9 Aspect Ratio - Flip-Over Mounting Feature Enables Quick Flip-Over Of The Privacy Filter To Share Contents Without Uninstalling - Filters Up To 75% Light Transmittance And Independently Tested By 3Rd Party Lab To Block 47% Of Blue Light In The 380-450 Nm Range - Easy Install With Side Mounting Tabs Adhesive Strips Or Flip-Over Tabs