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.