In addition, there are devices that have been specially designed for the presentation of virtual content. Initially these were glasses for Virtual Reality, but now there are also corresponding concepts for Mixed Reality. The Microsoft HoloLens, for example, is specially designed for AR. This system requires no additional devices to provide the user with additional information. Microsoft also developed HoloLens with the needs of companies in mind. Smartglasses, data glasses and AR headsets from other suppliers work according to similar principles.