A cart is configured to handle replaceable plates used on the blade of a plow or grader. A set of channels is selected based on the results of performance testing and specified criteria. This embodiment uses two different power managers to manage the power consumption of the device and the power domain. The fan is controlled by a rheostat so that a user may variably control the rate of air directed into combustion chamber, thus controlling the rate of combustion of the combustible material. The inputoutput device monitors the timer to identify when a time period allotted for the response to the transaction is exceeded. Also, there is no need for transmission of sensitive subscriber information over the air once a connection is established, because the download client provides the minimal data needed to facilitate the checking and updating of the software.