Features: 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 percent of UV rays and suppressing 65 percent 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) PackageList: 1 x Protective Film 1 x Dust Free Cloth 1 x Plastic Tower Buckle 1 x Double Sided Adhesive 1 x User Manual