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Product Description The 4M Potato Clock teaches young minds the value of green energy in an illuminating way. 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. Detailed assembly instructions included. No batteries required. From the Manufacturer You may know potatoes as a good source of potassium, but did you know they can be used to power an alarm clock? This kit contains a digital clock, instructions and everything you need (minus the spuds) to run it.