This isn't the first water-powered clock to be sold, but it is a lot more attractive than some I have seen. The other one I wrote up over a year ago not only was cheap, but looked it.
Although this one is indeed cheap, it at least has a nice clean look to go with it. To get the clock working you just add water and a dash of salt. The clock has a set of electrodes that then extracts energy from the compound particles in the water.
It doesn't use any batteries, and will be released for purchase as of August 15 of this year. You can preorder it now for $16.