Warning Siren - Federal Signal Thunderbolt - Demonstrating 4 Signals ( HD Rescale )

Описание

Permission were taken from the original video owner since 2009.
This video can be educational for recognizing the kinds of signals used in Civil Defense Outdoor Warning System which is sounded ( of course ) by the Warning Sirens :)
1- Pulse - which was simulated in the video ( used for Nuclear Fallout or Early Warning on a certain regions )
2- Wail ( Danger or Attack )
3- Alert A.K.A Steady Tone ( used for early warning or All Clear on a certain regions )
4- High-Low ( Fire Emergency )
*Hope you enjoy this video*