not loud outdoors

This is not very loud. We were trying to use it at an outdoor game and you could barely hear it. Not sure how much is the iPhone speakers and how much is the lack of power behind it.

Overall, it definitely DOES sound like a marine air horn, tho. So if you are just looking for sound, this is your thing. If you are looking to make some noise outside, dont look here.

VenturaBumm about Air Horn (Free!), v2.4