This is my watch. Supposedly waterproof to 200m. Didn’t survive a week in the swimming pool on holiday though – but that might be because I changed the battery myself and the seal may not have been as good as it was when it came out of the factory.
I can’t really say much about the internals, but as you can see the circuit board is separate from the screen; there is a rubber seal that goes around the back; and although the screen guard is removable, the watch face itself seems to be glued in place and can’t be removed (easily). I was also intrigued to find that the beeps are made by vibrating the metal back of the case – you can’t hear them when the watch is apart.
The good news is that after a couple attempts at drying it out (in the end, I used a hot air gun on a low setting), the watch works again, although I think the battery suffered as it doesn’t like to illuminate very often. I’ve had a fair few troubles with the battery in this watch so it is no great surprise that it is being temperamental again!
Perhaps this photo will be of use to someone?