3M's Privacy Filter PF400 safeguards your privacy. 3M microlouver technology makes on-screen data visible to persons directly in front of the monitor, but not from the side. These filters also dramatically reduce glare, block up to 99.9% of ELF/VLF E-field radiation and help stop static and dust buildup. 3M Computer Filters are now available with 3M's exclusive Easy Clean technology. No expensive cleaners are needed. Cleans easily with just water and a soft cloth. This filter is intended for 16" - 18" monitors.