The STH-10 was a siren manufactured by Federal Signal from 1955 to 2006.
The STH-10 produced __ decibels of a single tone. It was available with a 7.5 HP single-phase motor and a 10 HP three-phase motor upon introduction, and a 7.5 HP three-phase motor was introduced later in the production run.
The STH-10 put out a tone that has been measured as being between 657 to 675 Hz.
The STH-10 is electromechanical and stationary.