I got a
Megalert Megahorn from a local shop, we tested it inside and our ears were ringing.
Due to some people saying it wasn't sealed all that well, I wrapped it in electrical tape and it has worked flawlessly in snow, cold, and rain, all places where the Airzound failed on me. It has saved me at least 5 times from being right hooked. I would consider using steel wire to attach the switch and horn as the stock mounting bands are a little weak.
The weight is around 2-3 oz.