Features Include:

PF21.5 fits widescreen desktop LCD monitors with a 21.5-inch viewing area diagonal and a 16:9 aspect ratio
Patented 3M Micro-louvre technology makes on-screen data visible only when directly in front of screen
Feel secure knowing that your valuable data is not being overlooked
Improves contrast and privacy without blurring or distorting images on the screen
Guards against scratches and damage to the screen
Reduces glare to help prevent eye strain and headaches related to monitor use
Easy to remove, though can be left in place while laptop is closed
Passers-by see only a dark screen; helps keep confidential and private information private
Reversible for either glossy or matte screen finish
Easy on easy off attachment system
One year warranty from date of purchase

General

3M PRIVACY FILTER 21 5 INCH W/S PF21 5W9