This is the best summary I could come up with:
A nationwide test of the federal emergency alert system will be broadcast at approximately 2:20 p.m. EDT to cellphones, televisions and radios across the United States at around the same time.
Wireless providers that participate in the integrated public system then dispatch alerts from cell towers to compatible phones in geo-targeted areas.
To make the wireless test more accessible for people with disabilities, alerts are "accompanied by a unique tone and vibration," according to FEMA.
So, most people whose cellphones are turned on and located within range of an active cell tower during the test should receive a message, the agency said.
FEMA's upcoming test recently sparked a wave of conspiracy theories online, which are not based on reality and misrepresent how the technology works.
Wednesday's test will evaluate the technological capabilities of the national alert system to reach and inform as many people as possible in case of a widespread emergency.
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