Embodiments disclose a system and method that distributes warning with a description the probability of the severity of the hazardous condition producing the warning and incorporating a policy engine for expressing rules for responding to the warning. The system comprising an electronic device and a digital audio transmitter. When the main source fails the back up source provides power to the DC power bus. Thus, a large amount of information is adaptively and efficiently used in generating the probabilities. In one package, transmitter surface acoustic wave filters, receiver surface acoustic filters, and phase shift substrates are mounted. In addition methods of use and construction are provided.