Kasstino Potato Clock Novel Green Science Project Experiment Kit Kids Lab Home School Toy Put some soft drink into the pots provided.Insert the copper and zice plates into the pots, as shown in the diagram. Taking care that the metal pates do not touch each other.The clock should now start to work. You may experiment with different liquids like salt water,fruit juices.Or fruit like lemon, orange,tomato etc.The fun is unlimited. Cup Size: 5.5cm x 5.5cm x 6.8cm - 2.17inch x 2.17inch x 2.68inch. Clock Size:6.7cm x 3.2cm x 1.2cm - 2.64inch x 1.26inch x 0.47inch. Please read the item description in the following, and learn how it works