Mobile communication devices, having multiple speakers andor microphones to perform a number of audio functions, for use with mobile devices, are provided. A plurality of heat exchange conduits has a first surface in fluid communication with the exhaust inlet and the exhaust outlet and has a second surface in fluid communication with the fluid inlet and the fluid outlet, wherein the first surface is coated with a material including Teflon\xae. The flange is a thin flexible patch comprises of multiple thin layers of materials and which conforms and attaches to the chest of the patient. Internal spacing rings may be used to provide additional separation between the inner and out pipes.