Just simply add water!

We've seen clocks powered by fruit, solar panels, ball-bearings, and all sorts of other things, but this is the first water-powered clock we've come across. We're not sure how it works, but it does! Simply fill the cells on the reverse of the clock with liquid - not only water, but tea, fruit juice even beer! The digital clock has both time and date settings.

The ultimate in environmentally friendly ideas, and absolutely NO RUNNING COSTS!