A method of delivering an instruction to a mobile user device connected to a network is disclosed. In one embodiment, the present invention is a heat exchange unit for an automobile including a core unit configured to be connected to a catalytic converter of the automobile, the core unit generating vapor, and a first energy generation module connected to the core unit, the first energy generation module receiving the vapor from the core unit and generating energy from the vapor. The beard trimmer with internal vacuum is comprised of an external body, which houses a motor, wiring, and a power source.