3M Privacy Filter For 20 Inches Widescreen Monitor (Pf200W9B), Black

Microlouver technology delivers world-class effective "black out" privacy from side views outside the 60-degree viewing angle
Reversible between a glossy side and glare-reducing matte
Reduces 35% of blue light transmission from the display
Provides touch compatibility on some devices. Scratch Resistant
Matte surface helps reduce glare and hide fingerprints