16:9 ratio. Protects valuable information by narrowing the viewing angle; onlookers see only a dark screen instead of sensitive information. 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. Use included adhesive strips to stick the screen to your monitor. Designed to fit 24 in widescreen monitors. Sold by each.