A random number generator includes a chain of pairs of D-type flip-flops 205, 215. The kit comprises a stimulation backing that includes a flat, electrically insulative, body having a pair of opposing first and second planar surfaces, and an electrode affixed to the first surface of the insulative body. The front cover includes at least two apertures, the body includes at least two holding components for placing LCDs, the bottom of each holding component mounted a LCD further for mounting a processor, wherein the processor is connected to the corresponding LCD through a bus. From the estimated bank angle, the system provides a corrected roll angle.