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The computer privacy screen filter uses ultra-fine louver optical technology to control the viewing angle of the screen within 60 degrees of the front side, protecting your business secrets and personal privacy, more freedom, more safe! T TKindly Reminder T1. It can be used directly after opening, without any treatment. T2. The anti-spying effect will be better with the shiny side. T3. The matte side can reduce the reflection, free choice. T4. It can reduce the screen brightness to get better anti-peep effect. T5. Use this screen protector in different environment, the anti-spying effect will be different. T6. It is better in the place where the natural light is sufficient during the day, and the effect is a little worse when the natural light is insufficient at night. T7. Due to the different screen sizes of different brands, it is normal to have an error of 1-3 mm for the privacy screen protector.