Found this at the Dollar Tree. Anyone who commutes in an urban area could really use this air horn. I carry one of these by mask taping it to my handlebar. When you’ve expended all the air, just tear it off and do it again. Masking tape leaves very little, if any, sticky residue. Or you could always carry it on our waist or backpack. Also, helpful to scare away dogs. For $1, it’s a steal.