Seamless Adhesive Integration Conveniently attaches to the Surface Book’s frame and eliminates any setup process. Limited Viewing Angle Narrows the field of vision to /- 30 degrees, helping keep the information on your screen private, reducing the chances of a visual data breach in the office or in public. Blue Light Reduction and Low-Reflective Coating Filters out harmful blue light rays by up to 22%, easing eye strain and reducing the chances of interrupting sleep patterns, while low-reflective coating improves clarity. Touch and Surface Pen Enabled Allows you to use your Surface Book just as you would without a privacy screen. Includes Cleaning Cloth Helps to keep screen clean and dust-free. The SA135 Privacy Screen for Surface Book 2/3 13.5" helps protect your privacy, without any mess or fuss. Easy to detach and reattach, the screen conveniently attaches to the Surface Book’s frame with pre-applied adhesive. Protects privacy by limiting viewing angle to /- 30°. Reduces harmful blue light by up to 22% and improves clarity.