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''ll be amazed! Caution: High Voltage Inspiration and Fun! Real Science & Real Fun 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. 4M Potato Powered Clock contains digital Clock with wires, pots, connecting wire, transparent tapes, copper and zinc strips and detailed instructions. Does not include potatoes. Recommended for ages 7 and up.The Potato Clock uses a pair of ordinary spuds to power a digital clock.This kit includes a digital clock, wires and prongs; two potatoes are all that's needed to create a working clock.This kit is ideal for young science enthusiasts, and offers a valuable lesson on the transformative power of green science.No batteries required.Recommended for ages 8 and up.