Siren (alarm)
A siren is a noise-making warning device. There are two general types: mechanical sirens and electronic sirens.
A siren is a noise-making warning device. There are two general types: mechanical sirens and electronic sirens.
A siren is a noise-making warning device. There are two general types: mechanical sirens and electronic sirens.
Source: Wikipedia "Siren (alarm)" · CC BY-SA 4.0
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