Infinity Hinge accommodates a full 180-degree range of angles for typing, drawing, and viewing plus a portrait viewing option with maximum stability Design complements device – crafted to deliver unobstructed access to all ports and buttons, and provide seamless Type Cover compatibility Optional Pen Loop – If you’re using a Surface Pen or Classroom Pen 2, attach the Pen Loop using the instructions provided Transparent case – to customise your device with your favourite images or allow your Surface Pro to proudly shine through Military spec protection – tested to meet or exceed U.S. Dept. of Defense Standard 810H protocols (26 drops from 4 feet) Age range description: Adult