Ecogadget has put together a list of Water Powered Alarm Clocks.
The one that stands out from the crowd is the unique H20 Multi Function Alarm Clock ($20) – running on a replaceable water-battery.
By just adding water you are providing the clock with an endless source of energy, never needing conventional batteries again! This clock also incorporates an innovative method for changing between modes – simply rotate the clock through 90-degrees to automatically change funtion from Time, to Alarm, to Temperature (F and C), to Coundown timer. The display automatically changes orientation with clever use of Newton’s gravitational theory!
(Via GadgetVenue)