Transform your 21.5-inch monitor into a private workspace with this versatile privacy screen filter. Using advanced micro-optical blinds technology, the screen maintains crystal-clear visibility from the front while blocking side views from prying eyes. The dual-sided design offers flexibility with a matte anti- on one side and a glossy finish on the other, letting you choose your preferred viewing experience. Measuring 18.8 x 10.6 inches, this PET film protector is specifically designed for 16:9 aspect ratio displays. Installation is straightforward with the included accessories - clean cloth, tape, and hanging sheet. The filter also helps reduce eye strain through its anti-reflective and anti-radiation properties, making it for extended computer use in both home and office environments. For screens smaller than 21.5 inches, the filter can be to ensure a fit.