5.?Protection Your Eyes?:The high-quality blue light filter layer of the 21.5 inch privacy screen for monitor can reduce 95% of blue light, 92% of ultraviolet light, and other harmful light to the eyes, thereby reducing eye fatigue caused by long-term exposure to blue light and protecting your eyes. Using Computer privacy screen 21.5 inch makes your eyes more comfortable when facing a laptop, and also allows you to rest better when not facing a laptop. 4.?Easy Installation?: There are two installation methods for the Computer privacy screen 21.5 inch: ? Permanent installation - double-sided tape. Suitable for all computers with a screen aspect ratio of 16:9 and a size of 21.5 inches. ? Removable installation - sliding installation tab. Suitable for computers with raised frames, you can slide Monitor Privacy Screen 21.5 Inch in and out of the screen as needed, providing a quick and easy way to remove display privacy filters when not needed. 3.?Hight Privacy Protection?:The 21.5 inch privacy screen for monitor adopts advanced multi-layer thin film filters, limiting the viewing angle to ± 30 °. Provide a clear view from the front while the side is not visible.Computer privacy screen 21.5 inch helps maintain the privacy of information on the screen and reduces the chances of privacy leakage. [Note: It does not block visibility directly behind you, regardless of the distance.] [Not optimized for touchscreens.]. 2.?Compatible With?:Computer privacy screen 21.5 inch size:Width: 18 3/4" (18.8 inches/477 mm), Height: 10 9/16" (10.6 inches/268 mm) - 16:9 Aspect Ratio. ZOEGAA Computer privacy screen filter compatible with HP, Dell, Acer, Asus, Sceptre, Samsung, Lenovo, KOORUI, PHILIPS, LG, AOC, AOYODKG, SANSUI, ViewSonic, BenQ, all in one pc desktop and other monitor brands.Please check the width and height of the screen before ordering Monitor Privacy Screen 21.5 Inch. 1.?ZOEGAA Factory?:The ZOEGAA factory is headquartered in Guangdong Province, China and was established in 2010. ZOEGAA factory has been focusing on the research and production of optical films for 13 years, possessing many international patents such as privacy filtration membranes and international trademarks. If you are interested, welcome to visit our ZOEGAA factory.