Hides Personal and Confidential Information - from anyone looking from the side, by limiting the viewing angle to +/- 30°, prevents people looking over your shoulder at the data on your screen Reduces Glare and Blue Light - anti-reflective coating limits glare from outside light, improving viewing clarity, filters out blue light rays by up to 42 Percent, reducing eye strain and sleep interference Protects the Screen - The privacy screen filter also protects the Surface Book 3 screen from scratches, damage and fingerprint traces; use the included cleaning cloth for regular maintenance Reversible Viewing - One side of the privacy screen has a matte finish to maximize glare reduction and reduce traces of fingerprints, the other is glossy and provides a clearer view of the screen Two Installation Options - Surface Book privacy screen can be mounted using tab holders that attach to the Surface Book screen edge, or mount it with double-sided tape directly to the screen