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STL-10 in Bloserville, Pennsylvania.
Company Federal Signal
Type Electromechanical
Sound output 114[1] dBc at 100 feet
Frequency 405 [1] Hz
Horsepower 7.5-10 [1]
Documentation Manual

The STL-10 was an outdoor warning siren produced by the Federal Signal Corporation. The model number 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.