Well, I wanted something loud to get drivers attention. I went to WalMart and got this:
http://www.walmart.com/ip/Attwood-8o...rhorn/16203677
And then to E-Bay for this:
http://www.ebay.com/itm/2pcs-Univers...item27d44e8af7
Voila! Loud horn on a bike, and I have tested it at temps in the 30's and it works. I'll have to wait for winter for colder temps to test it on. It is LOUD!