Port Designs Privacy Filter 13.3 is a confidentiality film for your laptop that is designed to protect the information displayed on your screen. Once in position, only the user sitting in front of the screen can see the information and any sideways view over a 30° angle is completely obscured by the filter. This filter is very easy to fit on your screen and it can be readjusted as many times as you like if you need to reveal the screen. It has anti-glare technology which reduces the strain of looking at your screen. The filter also protects your screen from scratches, stains and impact.