Civil defense siren
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A civil defense siren is a form of siren used to warn civilians of approaching danger - a form of emergency population warning. Initially designed to warn city dwellers of air raids during World War I
An HSS TWS 295 Siren (license-built Whelen WPS-2905) in Saudi Arabia
Federal Signal Thunderbolt 1003 in Louisville, KY
There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year on the first Wednesday in February. Sound sampleⓘ
Federal Signal Model 5 in Ballston Spa, NY
Federal Signal Modulator
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Federal Signal Modulators are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis,
Civil defense siren
…pattern. A directional siren may be applied where notification is only required for a defined area in one direction. Kuwait has an entire siren system of Federal Signal Modulators. They once had an entire system of Thunderbolt system 7000's, until they were all replaced. However, one System 7000 remains on display. Iran & Iraq…
A Federal Signal Modulator siren in Bay Head, New Jersey.
A Federal Signal Modulator MOD6024.
A Federal Signal Modulator II MOD6024B in Hawaii.