The Emergency Alert System (EAS) is a national public warning
system that requires broadcasters, cable television systems,
wireless cable systems, satellite digital audio radio service
(SDARS) providers, and direct broadcast satellite (DBS) providers
to provide the communications capability to the President to
address the American public during a national emergency. The
system also may be used by state and local authorities to deliver
important emergency information, such as AMBER alerts and weather
information targeted to specific areas.