The blue plastic potato (fruit) clock has two compartments designed to hold potatoes or fruit. Two coils, one red and one blue, are inserted into a different potato while the green coiled wire is connected to both potatoes. The clock will demonstrate the principles of an electrochemical cell. The LED clock runs on 2 potatoes, oranges, grapefruits, lemons or cans of soda pop. Potatoes not included. Measures 8-1/2" length by 3-1/2" width by 2-3/4" height.