Kensington Snap2 Privacy Screen Filter 20 - 22 InchDescriptionSpecificationsShipping Narrows the field of vision on the monitor to + 30 degrees, helping you keep the information on your screen private, which is important when you're viewing confidential or sensitive information at your desktop Installs on the top of your flat panel monitor, with adjustable springs so it can be extended to the edges for easy mounting Filters harmful rays by up to 30%, which is helpful as blue light has been shown to