To date only 3M(TM) Polarizing Filters are proven to elevate monitor performance as tested against ISO 9241-7 by TUV Rheinland Product Safety. ISO 9241-7 compliant for ultimate monitor performance. Reduces glare up to 99%; prevents static and dust build-up when properly grounded; blocks up to 99.9% of ELF/VLF E-field radiation when properly grounded; utilizes the assembly-free flat frame design; outside dimensions: 12.86 x 15.46 x 0.40 inches (327 x 393 x 10.2 mm); viewing area diagonal is 18.22 inches (463 mm); utilizes optimal tint glass for brighter graphics and sharper text; warranted against defects for as long as you own your 3M Computer Filter; cleans easily with a soft, lint-free cloth and glass cleaner; meets the American Optometric Association guidelines for video display terminal glare reduction. Includes a mail in offer for a free 3M(TM) CD/DVD Cleaning Cloth.