tsquale
Lifetime VIP Donor
After reading about this here a while back I began my hunt for one. I was able to get in touch with the original inventor and get his last one out of storage! The Duosonic tone is a combination Wail / Yelp simultaneously and will make your brain hurt if you listen to it too long. I can imagine it would be quite effective due to the uniqueness. A real first go at a "dual tone" siren. Here is a quick video that I made of it.
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