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STL-10 in Bloserville, Pennsylvania.
Company Federal Signal
Produced 1953 - 1995
Type Electromechanical
Sound output 114[1] dBc at 100 feet
Frequency 402.5 [1] Hz
Horsepower 7.5-10 [1]
Succeeded by Eclipse
Documentation Manual

The STL-10 was an outdoor warning siren produced by the Federal Signal Corporation. The STL-10 was a very simple 7 port siren with a 20.5 inch rotor, which was the same size as the one on the STL-10's high tone counterpart, the STH-10. STL-10 stood for Single Tone Low, 10 horsepower.


  1. 1.0 1.1 1.2 (PDF) Service Manual, Outdoor Warning Sirens, Models 2, 5, SD10, STH10, STL10. Federal Signal Corporation. Retrieved February 16, 2016.