A method and apparatus for generating and controlling volume of a speaker of an appliance is disclosed. In one embodiment, a plurality of circuit boards are operative to perform communication functions in a network, where the device includes a first circuit board and a second circuit board. The finger has a shape and size to allow interconnection with an adjacent card guide. The display pattern selected by the logic control unit depends the magnitude and rate of turn. The invention may also relate to a method of improving the fluidic flow through a membrane mesh structure for the transportation of bodily fluids from a point of sampling to a point of measurement.