These devices work by detecting the faster traveling "P" waves that immediately precede the damaging earthquake "S" waves. The warning time works out to around 1-3 seconds for every 5 miles distance between you and the epicenter of the earthquake. For the Magnitude 8 earthquake risk we face here in Saint Louis, Missouri, that works out to 37 to 111 seconds of warning time. We'll have a follow up video to go into more details.
Below are Amazon links to the detector we use and other similar devices.
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