The Kensington Security GlareMaster� Premium Anti-Radiation Filter is a glass filter for your 16-19 monitor that keeps sensitive info confidential. Its special film laminate limits viewing area to ensure that only people directly in front of the monitor can see the screen. Also, the optical quality glass has multi-layer anti-reflective coating to enhance contrast, and it helps reduce ELF/VLF radiation by 99 percent. Protect yourself and your information with the easily installed Kensington Security GlareMaster Filter.