Can't remember the brand but I had an air horn at one time. You pump it up to 80psi. Unfortunately, once the adrenaline gets pumping, with my adult ADHD, I tend to get obnoxious. I kept tooting the horn whilst genrally being a nuisance on the walking paths on my college campus. People jumping up 4 feet in the air, sometimes spilling their books! The air horn did not last long before whimping out. Also the cable eventually got severed and stopped holding air. I still have it somewhere and could easily patch it up again.

Bottom line, if you're the kind of person to get some cool bling like a super loud horn andl want to show it off every chance you get, with ten seconds of air time, it won't last very long.

Also, the bottles were basically made like an 8 ounces or so plastic soda bottle, probably to appease the 'weenies who would likely have no use for such a frivolous device. If the cable could be lengthened and retrofitted onto a larger bottle, like say a longer cable to a 2-liter coke bottle on the back rack, it would last a lot longer. I wonder if a 2 liter bottle could withstand 80psi though.