The Targus 20.1" LCD Monitor Privacy Screen is designed to fit 20.1" LCD monitors. To protect your information tiny vertical blinds on the surface of the screen narrow the viewing angle so data is only visible directly in front of the monitor up to 45 degrees away from the center of the screen. Onlookers will only see a dark unclear screen when attempting to view the information from a side angle. In addition to providing security the privacy screen also blocks the glare to help reduce eye strain.