loudbicycle.com

I'm actually thinking about buying some of the aftermarket air horns, the ones intended for use on a car that come with an electric compressor, toss out the compressor and hook up an air valve and a bottle sort of like the AirZounds does.

Either that or experiment and find a replacement diaphragm for the AirZounds that actually friggin' works below 30 degrees, so that I can use it the other 1/2 of the year.