Are you looking for a novelty clock ?
You can try the Eco-Friendly Water-Powered Clock from Bedol.
The  clock does not need any batteries and any  electricity.  Just need water and salt !! Cause, it is powered by water and a pinch of salt. The electrodes inside the clock use energy from water for powering.

The entire device has 4 inches high and 3 1/2 inches wide.

So, you don’t need to buy batery anmore.


Thats mean you can help saving energy for the earth.