Super-affordable, green, saltwater powered clock! With enough of these, we might one day worry about the price of seawater.

Just water! From the page: "Clock is the most accurate, environmentally practical, hassle-free chronometer of its kind. Want a high quality, beautifully designed clock that literally runs itself? Look no further."

W water powered desktop clock, no batteries necessary! (via amazon.com)

amazing eco water clock is great! Just was shipped to my house today. I wish it had an alarm though.

Another fun function water-powered clock for you to enjoy! This clock operates off of water and a little bit of salt which means no batteries! No batteries means no more trash, no more toxic chemicals leeching into water, and a better environment. This clock is completely affordable too.