This is the annual siren test of Day County, which happens on every-other Sunday of every month, At 11:00 AM. Name: Federal Signal 2001 DC (Enthusiasts call it a 2001 Roundback) Chopper port: 12 (Single tone) Pole height: around 17 Ft. Other sirens heard: ACA P-10 Decibel output: 127db At 100 Ft. Location: In the town's downtown area. Cool Facts: This is the first generation of the FS 2001 series. It is the predecessor of the Thunderbolt, with a battery backup. It's also called a FS 2001 Roundback, because of it's, well, round back!