【Privacy Screen Filter Size】-- If the visible area of your display has the following dimension: Width x Height (Exclude Frame/Arrow 1-3mm errors): 20 9/16" x 11 9/16" (522mm x 294mm), then this filter is good for you. ★★Very Important to double check your screen's Width and Height excluding frame before ordering. It's not recommended to make your selection based solely on your screen's diagonal size. | 【Left& Right Privacy】-- Note: Not block visibility directly behind you, regardless of distance! The privacy filter makes the screen appear dark when looking at it from an angle (left and right 30°- 180°), but clear when looking directly at it. To change the privacy levels, simply adjust your monitor's brightness level accordingly. | 【Matte & Glossy Sides】-- It's a reversible privacy screen filter, giving you the flexibility to choose glossy or matte finish. The matte side will have less glare, however the glossy side will have stronger privacy! | 【Perfect for Open Workspaces】-- Ensure your working space is bright and well lit. Privacy screens do not work in dimly lit areas. | 【Two Installation Option】-- Option 1 uses clear double side adhesive strips that securely attach to any computer screen. Option 2 (for computer screens with a raised bezel only) uses slide mount tabs that easily stick to the display frame, allowing you to take out the privacy screen filter easily as needed.