The Targus 13.3" Widescreen Laptop Privacy Screen, part number ASF133WUSZ, is a privacy filter designed for 13.3-inch widescreen laptops. It functions by narrowing the viewing angle of the laptop display to within 45 degrees of the screen's center, utilizing tiny vertical blinds. This ensures that information is primarily visible only to the user directly in front of the monitor, presenting a dark and unclear screen to those attempting to view from side angles. Beyond privacy, the filter also incorporates glare-blocking properties to help mitigate eye strain during extended use. Installation is facilitated through two methods: clear adhesive strips specifically for LCD screens or included tab guides that secure the filter to the LCD edge, allowing for easy sliding on and off.