1.Anti-spy,viewing angls 60 degree 2.Anti-glare,.Anti-scratch 3.8.9"-21" 4. ... , white, blue, black.5,Types:180 degree anti-spy (anti-spy on the hirozontical direction); 360 degree anti-spy (anti-spy on the ... screen4. take out the plastic card to scratch the air bubble, and remove it to the side of the filter.5 ...