Loud "Red Lady" with strong voice as german WW2 fire siren in action

This is a short but a loud siren-test of an over 70 years old "red lady". You can see and hear an original german fire-siren contructed by Siemens in the 30ies of WW2-times. This rare siren has a sound-frequency of 145 Hz. It was in use in case of fires during war times. Have fun with watching this interesting video of an old & loud "red lady". I called this fire-siren "red lady" because of her outside colour.