Blankibr wrote:
Be careful of the safety blaster horns. When the membrane gets wet, they don't
work. You can flick the water off it, but that takes a few more seconds
(several flicks).

I carry mine in a PFD pocket where it gets soaked all the time and it's
never failed to work. I do carry it with the open end down, so it
doesn't fill with water. Perhaps that's the actual issue?