You will find them on pylons and rooftops, in industrial quarters, prisons and even on beaches. Alarm sirens are installed around the world to warn about potential threats and dangers. For some, the sound of a siren is an everyday reminder that work is over; to others, sirens are a nuisance -- particularly if they are being tested frequently (and if they happen to be installed next to your home).
While the main purpose of sirens is to save lives, they can also become a symbol of death and destruction during wartime. For victims of war, the unnerving sound of an alarm siren is a harbinger of terror, deeply ingrained in their traumatised souls.
These are good reasons to take a closer look at the characteristic sound of an alarm siren. Traditionally, sirens were entirely mechanical, motorised constructions, but nowadays they are increasingly being replaced by electrical signals or even mobile phones.