The Kensington MagPro Magnetic Privacy Screen Filter for 21.5 inch 16:9 monitors offers best-in-class privacy protection. It attaches and removes quickly and easily via a slim magnetic strip, making it an ideal solution for slim bezel or edge-to-edge displays. The filter narrows the field of vision to +/- 30 degrees, preventing unauthorized viewing from the sides. It also reduces harmful blue light by up to 22%, easing eye strain and reducing the chance of interrupted sleep patterns. The low reflective coating diminishes glare and improves clarity. The filter is reversible, with a matte side that maximizes glare reduction and reduces fingerprints, and a glossy side that provides a clearer view. It also protects the monitor from scratches and damage. An antibacterial cleaning cloth is included to keep the screen clean.