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P-50 Official.jpg

The P-50 (later RM-135 and T-135-AC) is a rotating, electromechanical siren that was produced by Alerting Communicators of America (later American Signal Corporation) from 1980 to 2006, when it was replaced by the T-135 AC/DC. It produces 135 dBc at 100 feet, and is the loudest electric siren in the world, as well as the loudest dual tone siren.