Fellowes Laptop/Flat Panel Privacy Filter with black-out technology darkens screen image when viewed from the side to prevent prying eyes from reading your monitor. Protects 20.1" laptop or flat panel screen from dust, fingerprints, and scratches. Reduces screen glare to help prevent eye strain. Product is 100% recyclable. Easy to attach and remove. Measure height, width, and diagonal viewing area of your monitor to ensure a proper fit. Filter Viewing Area: 12-1/8" x 16-1/8" (H x W), Diagonal Viewing Area: 20-1/16".