Feature: 1. 20in Size: Width: 441mm, Height: 248mm, diagonal: 20in, 16:9 aspect ratio, anti glare, anti reflective, UV and blue lamp reduction, protects monitor from scratches. 2. Applicability: Ideal for maintaining screen secrets in areas such as open work spaces, airports, airplanes, trains, coffee shops, office environments, financial institutions and other public places. 3. Secrets Angle: Computer screen filters make the screen appear dark when viewed from a certain angle (angle of about 30°‑60°), but bright when viewed directly. To change the angle from 60° to 30°, simply adjust the monitor's brightness level. Effectively obscures secrets when viewed from the side at 30° or more. This feature is only available on the left and right side. 4. Anti Blue Lamp, Eye Protection: Protects your eyes by filtering 96% of UV rays and suppressing 65% of blue lamp. This is a reversible secrets screen filter, available on both sides, giving you the flexibility to choose glossy or matte side, and select matte side to reduce external glare. 5. Two Installation Methods: 1. Use the clear adhesive strip to securely attach to any monitor. 2. Removable snap in mounting so you can install or remove as you see fit. Can be installed in about 30 seconds. Specification: Item Type: 20in Computer Screen Filter Product Material: PET Product Size: 20in Aspect Ratio: Approx.16:9 (441 x 248mm / 17.4 x 9.8in). Package List: 1 x Protective Film1 x Dust Free Cloth1 x Plastic Tower Buckle1 x Double Sided Adhesive1 x User Manual