A transmission for coupling a starter-generator electrical machine to an internal combustion engine and having a transmission ratio that is a function of the rotational speed of the internal combustion engine. Some implementations include ergonomic positioning of a carrying handle relative to positioning of a fan-assembly to make the system easier to carry. The output contains patient-related information which only the physician knows. Each passenger can enter an input that indicates they have donned the mask, so as to see further imagery for guidance. When a viewer requests a digital data stream from the media server, a content resolver, coupled to the media server, determines how to service the request based upon the appropriate user profile.