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P-50 Official.jpg
Company Alerting Communicators of America, American Signal Corporation
Type Electromechanical
Sound output 135 dBc at 100 feet
Horsepower 50
Succeeded by T-135 AC/DC

The P-50, later known as the RM-135 and T-135-AC, was a rotating, electromechanical siren produced by Alerting Communicators of America and later American Signal Corporation. The rotor and stator are shared with the Cyclone. It holds the title of the world's loudest dual-tone siren as well as the loudest electric powered siren.