Features: 1.21.3 Inch Computer Screen Filter: The 21.3 inch computer screen filter effectively shelter secret when viewed from the side at more than 30 degrees. 2.Eye Protection: Secret protection, anti glare, anti reflection, UV and blue light reduction, defend display from scratches. 3.Double Sided: Double sided usable, frosted surfaces anti glare coating design, smoothing surfaces has clearer picture. 4.Parameters: Width: 432 mm, height: 324mm, width to height ratio of 4:3. Easy to install, 1. Use transparent rubber strip installation. 2. Clamp type installation, detachable. 5.Wide Applications: Perfect for use in open work spaces, airports, airplanes, trains, coffee shops, and other public places. specification:Item Type: 21.3 Inch Computer Screen Filter Material: PET Product Size: 21.3 Inch Aspect Ratio: 4:3(432x324mm) PackageList:1 x 21.3InchComputerScreenFilter 1 x Dust Free Cloth 1 x Plastic Buckle 1 x Double Sided Adhesive 1 x User Manual