The Targus Privacy Filter is designed to protect confidential information that is displayed on your laptop. It features tiny vertical blinds on its surface that narrow the viewing angle to a band that is limited to 45 degrees on either side of center. Onlookers will only see a dark, unclear screen when attempting to view the display from a side angle. The laptop screen filter also blocks glare to help reduce eyestrain. It is easy to install by using the adhesive strips with tabs that are included. This screen is highly portable, easy to use and is made with high quality for premium performance and long-lasting use.