Built during the post-World War II Cold War era from 1952-1957 by Chrysler, its power plant contained a newly-designed FirePower Hemi V-8, 331 cubic inch 180 horsepower (130 kW) engine.Its six horns, were each three feet long. The siren could be heard from a distance of 25 to 30 miles away and had an output of 138 dB and 30,000 watts. They were 12 feet (3.7 m) long, built atop a quarter section of a Dodge truck chassis rail, and weighed an estimated three tons.