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The QM-4.5V-20HZ-LED has an internal vertical geophone sensor and custom electronics to detect ground vibrations from nearby sources like blasting, machinery, traffic, and local earthquakes that are in the 4.5hz to 20Hz range.It will NOT detect most distant earthquakes because their predominant vibrations are generally at frequencies below 1 Hz.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.