Kensington FP230W Privacy Screen for 23-Inch 16:9 Aspect Ratio Widescreen Monitors (K55798WW) Frameless tab holders let you easily insert and remove from your monitor screen Limits viewing angle +/- 30 Degree which is convenient for hiding personal or confidential information on your desktop Reduces harmful blue light by up to 30% 16:9 aspect ratio for a great fit Protects the screen from scratches and damage Screen cleaning cloth included 2 year limited warranty valid only when purchased from a Kensington authorized reseller. Amazon is a Kensington authorized reseller.