This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
This is a Gurnee, IL Whelen 4004, these 4004s had replaced a system of dual-toned P-10s. If you listen closely, you can hear another Whelen 4004 sounding Alert, and voice, and at the end a Whelen 4004 can be herd sounding wail tone. Gurnee, IL Whelen 4004 Tornado Siren in Alert
