Made using quality 3M Materials, this lightweight, framed privacy filter is designed for desktop LCD monitors. The Microlouver privacy technology allows only persons directly in front of monitor to view screen image with no blurring or image distortion. When viewed at an angle, the screen image goes dark. Lightweight filter can be easily removed for shared viewing with no damage to your desktop monitor. Privacy Shield fits 20" wide-screen monitors & measures 17-7/16" wide x 9-13/16" high.