A method for data transmission is disclosed. Each monitoring device includes at least one sensor for collecting data, a data storage device for storing the data, a processor for analyzing the data, and a communications device for transmitting and receiving data. In some embodiments, the at least one mobile device may further receive an indication of an identity of a leading speaker of the speech in the at least one audio signal, the leading speaker being identified from among the plurality of first participants, and may render the identity of the leading speaker to the at least one second participant. Temperature sensors can monitor a load temperature and the parasitic loads can be controlled based on the temperature readings.