Be a scientist as you discover how to power this digital clock using potatoes. Experiment to find out what other substances will power the clock – you will be amazed! The two Potato Clock allows you to generate enough electricity to run a digital clock using potatoes! Just push the zinc and copper electrodes into the potatoes causing an oxidation/reduction reaction that is converted to low voltage. Watch your child’s delight and sense of accomplishment with the clock they create. Model 4568.