The MS-390 Motor Siren is a high-volume, motor-driven industrial alarm and security horn. It features a red metal housing with a chrome-finished sound funnel and operates on a 12V DC power supply as indicated on the label.
- Sound Output: Produces a piercing, high-decibel wail (around 110–125 dB) designed to carry over long distances.
- Applications: Widely used for security alarm systems in commercial buildings, warehouses, factories, schools, and on emergency or work vehicles.
- Operation: Powered by an internal electric motor that spins a rotor inside a slotted drum to generate the distinct acoustic air-raid siren sound.






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