1. A disaster alert system comprising: a transmitting central disaster alert station and a plurality of receiving disaster alert modules said disaster alert modules being remotely located and independent of each other; code selecting means in said central disaster alert station for selecting a module activation code, from a plurality of possible codes (2.sup.n), designating the selected disaster alert module(s) to be activated; coder input means in said central disaster alert station for generating repeating frames of said selected module activation code; radio frequency (RF) circuit means in said central disaster alert station for converting said frames of said selected module activation code to a modulated RF first signal of a selected carrier frequency; audio input means in said central disaster alert station for accepting live or pre-recorded audio disaster information messages; Rf circuit means in said central disaster alert station for converting said audio input to an audio modulated RF second signal of a selected carrier frequency. Rf amplifier means in said central disaster alert station for amplifying said RF first and second signals; Rf transmitting means in said central disaster alert station for transmitting said RF first and second signals; Rf receiver means in said disaster alert module for receiving said first and second signals; decoder means in said disaster alert module for analyzing RF signals at said selected carrier frequency of said first signal, and providing a power switching output signal upon detecting the module activation code appropriate for said designated disaster alert modules; rechargeable battery power supply means in said disaster alert module for providing a continuous low power output, and a switchable high power output, said RF receiver means and said decoder means in said disaster alert module remaining in continuous standby condition and powered by said low power output; power switching means in said disaster alert module, activated by said power switching output signal of said decoder means, for applying said high power output to a plurality of module output means; first module output means in said disaster alert module for providing a clearly audible alarm; second module output means in said disaster alert module for providing a clearly visible alarm; third module output means in said disaster alert module for demodulating and amplifying said RF second signal and reproducing said audio disaster information messages; fourth module output means in said disaster alert module for controlling desired auxiliary units consisting of a plurality of alarm or warning devices of specialized purpose; module output function control means in said disaster alert module for controlling the sequencing and durations of operation of said module output means, when appropriately activated by said disaster alert module decoding means.