Cops said they didn't know the alarm was used in the dystopian movie franchise. Police officers in a Louisiana town are apologizing to residents after they alerted them to their coronavirus-related ...

Police in White County, Tennessee, spent approximately $13,000 to fit their patrol cars with the necessary hardware for a digital siren. That's right, as high-tech as that sounds, the digital siren ...

CROWLEY, Louisiana -- Emergency curfews in south Louisiana usually happen during natural disasters like hurricanes, but the coronavirus pandemic is unprecedented. Apparently, the way law enforcement ...

Most drivers pull over when they hear an ambulance siren. But not everyone knows that each sound signals a different stage of ...

Police in White County, Tennessee, spent approximately $13,000 to fit their patrol cars with the necessary hardware for a digital siren. That's right, as high-tech as that sounds, the digital siren ...

The Police Siren circuit uses two 555’s to produce an up-down wailing sound. The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage ...

A new siren system uses four speakers, and a device called a Rumbler, which creates low-frequency vibrations to help ...

CULVER CITY, CA — Police cars in Culver City are now equipped with additional, distinctive-sounding sirens — and if residents happen to hear the alarm, it means it's time to evacuate. Culver City ...