Where do you think I can buy an impermeable clock with voice recorder?

[Edipo]

Hallo to all.
I am looking for a good impermeable or underwater clock with voice recorder function, even like that one of the cellular phone, where you click a button and it register, but I can't find it.
I bought something like that, the casio DBV 3000, but it wasn't impermeable .
I bought a chinese one too, it says "water resistant", but when you go under the water a few humidity passes and the contacts are oxidized therefore it doesn't works anymore.
Anyone knows a truly impermeable or water resistant model?
Any suggestion or link?
Thanks to anyone that can help me.

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You have never see gifts ideas like these! (regali on italian)