Removable 2-way privacy filter for 54.6 cm (21.5") 16: 9 monitors Dual filter limits viewing angle to ±30 Self-adhesive filter is easily applied and removed as needed Blue light reduction: Filters out the harmful rays by up to 48%, easing eye strainand aiding natural sleep patterns Touch screen compatible with anti-fingerprint coating: Up to 3H hardness, makes fingerprints on the filter surface invisible. Anti-glare coating: Reduces glare from any outside light sources