The monitor privacy screen cover is easy to attach and remove. Simply attach the 21. 5-inch privacy screen to your 16: 9 aspect ratio display using the attachment strips or slide-mount tabs. This confidentiality screen filter is also reversible. The matte side provides you with glare reduction and the glossy side of the widescreen computer privacy film provides increased clarity. Protect Your Privacy The privacy screen protector for desktop monitors is a great investment when it comes to protecting your data. It is a convenient and cost-effective way to keep your classified information, intellectual property or any other important data you wish to keep protected. You can have a peace of mind while working in the office or public environments because you know your screen is protected with the 30+/- degree privacy viewing angle. The cutout on the top corner of the privacy screen makes it easy to remove for sharing content with trusted audiences or switching between finishes. Blue Light Reduction The PC display security filter is designed to filter blue light (390nm~480 wavelength) that can cause digital eye strain and can disrupt sleeping patterns. Reliability This PRIVSCNMON21 is backed by a StarTech 2-year and free lifetime technical support.