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Reference.org
Federal Signal Modulator
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<p>Federal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by <a href="/facts/Federal_Signal_Corporation/uYLnhmJc">Federal Signal Corporation</a> that are used to alert the public about <a href="/facts/Tornadoes/HSGNQzHa">tornadoes</a>, <a href="/facts/Severe_weather/9kD3FWWU">severe weather</a>, <a href="/facts/Earthquakes/NGjIzagw">earthquakes</a>, <a href="/facts/Fires/M6XwR3am">fires</a>, <a href="/facts/Lahars/WM2kUufP">lahars</a>, <a href="/facts/Tsunamis/N3xGNHBl">tsunamis</a>, or any other disaster. They are identified mostly by their distinctive stacked "flying saucer" design. The Modulator II is sold based on the more compact chassis of the <a href="/facts/Siren_(alarm)/RHtWCJJq">siren</a> compared to the original Modulators. </p>