Blacks out screen image when viewed from the side to prevent prying eyes from reading your screen, while keeping a crystal clear screen image from straight-on view Protects screen from scratches and fingerprints and is easy to attach and remove; TAA Compliant Reversible; matte side helps reduce glare and filter is compatible with touchscreen laptops and monitors Privacy filter fits widescreen monitors with a diagonal screen measurement of 21. 5\" (viewable area only) and a 16: 9 aspect ratio; Actual filter dimensions are 18-3/4\" W x 10-9/16\" H