The 21.5-inch Monitor Privacy Filter utilises the patented 3M microlouver privacy technology to block the vision of wandering eyes from viewing your screen while at work. It also guards your screen from scratches and smears. Lightweight and easy to install, including 3M Command strips and Monitor Hooks High-grade optical film ensures high clarity with no distortion Anti-reflective coatingMaintains high clarity Residue-free removalEasy to apply and remove