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A siren is a loud noise-making device. Motor sirens produce easily recognizable sound using an electric motor which turns a rotor that spins inside a slotted drum. The siren pulls air into the drum using centrifugal force.
The rotors force the air out of segmented slots producing bursts of air. The frequency of these air bursts determine the pitch, and produce the characteristic wail synonymous with motor driven sirens.
These motor driven siren are easy to use. Simply plug it into a standard wall electrical outlet with a on/ off switch. Now available in 3 Models (Sizes) – 190, 290 and 390