Hi Jeff,
This is what I bought >> http://item.taobao.com/item.htm?id=2789473257
Sounds like a loud air horn, or a loud trumpet. Not as loud as a truck's, I'd like it to be louder. But I'm not sure I it's safe to have anything louder that close to my ears. A sound meter application on my phone reads 80 db. Also, it doubles as a blinker at if the headlamp is on. I can see the lamp dim to half intensity when I 'blow my horn' :lol8: