PROTECT SENSITIVE DATA: This monitor security filter provides privacy outside +/-30 degree viewing angle from the center of your 16:9 21' widescreen display, keeping data on your desktop screen confidential EASY APPLICATION: Using adhesive strips that won't leave permanent residue, apply the removable privacy filter cover to monitor bezel w/ the side mount tabs or directly to the screen for long term use BLUE LIGHT REDUCTION: In addition to protecting your data, this PC monitor privacy screen minimizes digital eye strain when working for extended periods of time by reducing blue light by 30% to 40%