Thunderbolt 1000T test Neola,IA

monthly test of a thunderbolt 1000t this siren is in Neola,IA it seems very old and doesnt sound fantastic but still ok the siren heard in the backround is a federal signal 2001-SRNB which was installed recently last year for some reason the thunderbolt didnt sound til the 2001 nearly stoped i got a little scared it wasnt going to go off, the two sirens next to the thunderbolt dont sound off anymore i think the thunderbolt went in place of them and they never got taken down