Not sure about the air horn to which you refer, but I got one of those cheapy air horns for my bike (a few bucks), and does it ever wake 'em up. I love it. In fact, on my last bike tour, several bikers ahead of me were taking the entire lane, and I knew that a huge truck was coming from behind, so I pretended I was the truck and blew my air horn. Did those bikers ever move fast! Anyway, I like the horn much more than the previous bell.