What! No batteries? 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! Contains digital clock with wires, pots, connecting wire, transparent tapes, copper and zinc strips and detailed instructions. Sorry, Potato not included! Try St Jacobs Farmers Market, you can purchase 50 lbs. for $12-$15 dollars.