Design includes a slim magnetic strip, allowing for quick and easy attachment and removal, limited viewing angle narrows the field of vision to +/- 30 degrees, blue light reduction filters out harmful rays by up to 22%, reversible Matt & Glossy sides. The patented MagPro Magnetic Privacy Screen Filter for Monitors 21.5 (16:9) can be attached and removed quickly and easily, offering best-in-class privacy protection. An ideal solution for slim bezel or edge-to-edge displays. Privacy screen filter protects monitor from scratches and damage, while providing privacy by limiting viewing angle to +/- 30. Reduces harmful blue light by up to 22%, diminishes glare and improves clarity. Reversible for matte or glossy viewing options.