An annunciator device operable to record and store a message can be disposed in close proximity to a user for playback of the message if the user becomes incapacitated or otherwise unable to respond. The apertured plates are arranged parallel to one another, with the apertures aligned. The two-tap MAC provides substantial power and area savings over conventional MAC-based FIR filter designs, and may be implemented in short or long communications channels. The transfer member is movable with respect to the frame between a stowed position and a deployed position with respect to the vehicle. An igniter burns the atomized fuel as the flames and heat are directed in a centrifuge within the combustion chamber.