Feature:1. WIDELY COMPATIBLE: Computer monitor screen 21.6 inches, compatible with for HP, for Dell, for Acer, for Asus, for ViewSonic and other brands of 21.6 inch monitors. Please confirm the measurement of the width and height of your computer screen before ordering.2. UNIQUE DESIGN: Provides you with a clear view. The computer filter makes the screen appear dark when viewed from an angle (angle of approximately 30 degree to 60 degree), but bright when viewed directly. To change the angle from 60 degree to 30 degree, simply adjust the brightness level of your monitor.3. SUPERIOR PERFORMANCE: Guards your eyes by filtering 96 percent of UV rays and suppressing 65 percent of blue light. This is a reversible screen filter that gives you the flexibility of choosing either a glossy or matte face, with the matte face selected to minimize external dazzle. This filter is anti dazzle and scratch resistance!4. EASY INSTALLATION: Two mounting methods for your screen protector, 1. Use clear adhesive strips to securely fasten to any monitor. 2. Removable mounting method, snap in mounting, you can install or remove it as you need.5. WIDE APPLICATION: The 21.6 inch computer screen filter is perfect for maintaining screen in high traffic areas such as open workspaces, airports, airplanes, trains, coffee shops, office environments, financial institutions, and other public places.Specification:Item Type: 21.6 Inch Computer Screen FilterMaterial: PETSize: 21.6 inches (Approx. 464x290mm / 18.27x11.42in) .Package List:1 x Protective Film 1 x Dust Free Cloth 2 x Adhesive12 x Double Sided AdhesiveNote:1. PET, no glue.2. Manual measurement please allow some error.