Siren 5
Siren 5 : Fire Pr) An emergency warning device that generates a loud continuous or varying sound wave by mechanically interrupting an air stream with a perforated rotating disk or cylinder or by amplifying an electronic signal. Note: Sirens are mounted on fire department vehicles and are used to warn traffic to make way when vehicles are responding to alarms. Sirens are also used at volunteer station houses to summon volunteer firefighters
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