The standard defines a VRA as the modular vegetated system (pre-grown vegetation in the form of modules, blankets or mats, growth media, root barrier, pavers and drainage system) and the roofing system (deck, membrane, vapor barriers, insulation coverboard, etc.). (liveroof.com)
For that price, you'll get the 10.1 inch device and a magnetic coverboard to cover, dock, stand -LSB-...] (newbestgadget.com)
The «coverboard» is only 0.2 inches thick. (gizmodo.com)