i was watching an episode of sammy hagar's rock n' roll roadtrip and he visited mickey hart (drummer/percussionist for the grateful dead, in case someone didn't know) at his home and attached studio. he had one of these in his garden outside the studio door. fully functional, and of course sammy had to try it out. i tried to find a youtube clip of it but couldn't. if i'm remembering it right, the siren blew the circuits out in mickey's studio it pulled so much current.
eta: i want to say mickey's had a horn on it also. the memory is fuzzy, this was over 2 years ago it aired.