Reduce glare and harmful blue light, and improve clarity with Kensington’s Anti-Glare and Blue Light Reduction Filter for 21.5 Monitors. This filter reduces harmful blue light by up to 43%, and features an antimicrobial coating (matte side only) that inhibits bacteria growth by up to 99% (tested to JIS Z 2801 : 2010E for Escherichia coli and Staphylococcus aureus). An innovative anti-glare coating (matte side only) reduces reflection and improves clarity. Seamless attachment makes installation and removal easy and mess-free. Innovative anti-glare coating reduces reflection and improves clarity (matte side only). This filter eliminates harmful blue light by up to 43%, easing eye strain and reducing the chances of interrupting sleep patterns. Antimicrobial coating (matte side only) inhibits bacteria growth by up to 99% (tested to JIS Z 2801 : 2010E for Escherichia coli and Staphylococcus aureus). Seamless attachment makes installation and removal easy and mess-free. Touch and pen enabled, so you can use your device just as you would without a filter. Included cleaning cloth helps keep your screen dust, lint, and smudge-free. Two-year warranty means you can rest assured knowing you’re covered by Kensington.