How does it work? I assume it's a water pressure sensor which requires more than a foot or two of water to activate, and some kind of timer, combined with the transmitter? (otherwise a collar doesn't really work -- I can keep my neck immersed in water all day and not drown...)
This seems like a great concept, but I'm curious as to how it works, how reliable/comfortable it is to wear, how it deals with false positives, and so on. The fundraiser page doesn't seem to address any of that.