A PROX reactor integrated with a heat exchanger and an operating method thereof capable of effectively controlling temperature of a preferential oxidation reactor so as to obtain optimal activation and yield. A catalyst in which copper oxide and zinc oxide are in intimate contact and form agglomerated particles allows for the increased selectively of the production of dimethylchlorosilanes. This allows an actual reading and recording of stored food temperature and the regulation of the temperature within a refrigerated space by a thermostat. When the antenna is viewed from above, the respective surface transmitter for transmission in a higher frequency band lies between the wings of said lower frequency band transmitters. Further, in the power save operation mode, the second processor restricts the internal operation and processes the information input externally. An optimization function forms an optimum operating speed desired value by linking the ascertained operating speed with production unit costs.