SiraTone

SiraTone is a brand of electronic outdoor warning sirens produced by Federal Signal Corporation which began production in 1981. These sirens were designed to broadcast high-intensity warning signals over a large area. SiraTone products are/were used for natural disaster notification, HAZMAT incident notification, fire call systems, and more. Most of the SiraTone line was discontinued in the mid-to-late 1990s and newer designs, like the Modulator and DSA (Directional Speaker Array), have replaced it. The SiraTone product line is not in standard production, as of 1995. An exception to the rule, the EOWS* 612 speaker array was sold on request until the mid-2000s.
Products.
Six models of outdoor warning sirens were produced under the SiraTone brand. Model numbers were designated by the lettering EOWS (Electronic Outdoor Warning Siren) and an asterisk, followed by a number representative of the respective siren's decibel output or speaker array setup. All models utilized re-entrant speaker horns, arrays of 100 watt speaker drivers, and produced six standard signals.
There was also a mobile vehicle-mounted version, at one time, called the EOWS* M12. 
Signals.
The sirens were able to produce these tones:
A unique feature of the SiraTone siren series was the ability to conduct routine tests with a Westminster Chime melody instead of an actual alarm tone, intended to be a more pleasant alternative to the use of actual alarm tones. This allowed for operators to test sirens without fear of public panic and still ensure siren speakers were fully functional. Various other signals could be added upon special request. 