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![NC#7: [HD] FS Thunderbolt 1003 Hi-Lo Tornado Siren Test Silverstreet, SC](http://i.ytimg.com/vi/DkCETm54Ya0/1.jpg "NC#7: [HD] FS Thunderbolt 1003 Hi-Lo Tornado Siren Test Silverstreet, SC")
![Federal signal corp. PA300 siren demo [Hi-Lo tone] (Without Speaker!)](http://i.ytimg.com/vi/WNTF1aOD5LQ/1.jpg "Federal signal corp. PA300 siren demo [Hi-Lo tone] (Without Speaker!)")
