This kinds of clock called Bedol Water Clock is Eco-Friendly Water Powered, you just have to follow the instructions to add some salt water to drive. As you read this, maybe you have thought of sodium hydroxide(NaOH) and things like that in the clock also like me. If it’s not that would be? Take a look at the following official illustrate…
Eco-Friendly Water-Powered Clock Blue

The Bedol Water  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.
Because the handsome Bedol Water Clock works 100% on natural power. It’s true. No batteries, no chemicals, no electricity – no pollution. You don’t even need to wind it up! Just fill the tank with natural tap water … add a splash of natural lemon juice … and you’re set for 6 to 8 weeks of accurate timekeeping before refreshing. (You won’t even lose time while changing water, thanks to the built-in memory chip!)
With its bold modern styling, space-age accuracy, and surprisingly low price, the Bedol Eco-Friendly Water Powered Clock is ideal for home or office – or as a unique gift item.
Measuring in at a tidy 4”x 3 ½”, this sophisticated item comes in a choice of four popular decorator colors.  For a Water Clock with an alarm see our newest addition to our line, The Bedol Water Clock with alarm. $16

The power is from a reaction between an acid and a base that yields a salt and water. Maybe it’s a sort of Eco-Friendly from a different perspective.

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