Disclosed is a system and method for inducing therapeutic levels of hypothermia in a patient in the emergent care setting. A bone conductionthroat microphone unit, assembled in the voice interface, converts the vocal cord vibrations of a diver to voice signals. The temperature sensor may be mounted to a button member for the button. The n-type and p-type active areas are electrically connected to a cathode and anode of a high reverse blocking voltage device, respectively. The power-driving unit includes a circuit board, and a first end of the circuit board has a plurality of posts. The first filter andor the second filter can be tunable.