In exchange water I'd not him now, but splashing or wet fingers are not a problem.
The structure is really awesome: Operation front speakers to the back (first sounds strange, but is fantastic because the sound is reflected on the wall).
Duration is for the sound to do with about 10 days in order that part :-)
Only criticism: The suction cup is indeed strong enough to even 2-3 hours to hang on the wall, but eventually he falls down.