Specification: Condition: New Color: As shown in picture Material: Plastic + Metal Wire length: Approximately 15 cm / 5.9 inches Size of zinc/alloy plate: Approximately 1 x 4 cm / 0.4 x 1.6 inches How it works: 1. The metal strips and potato create a simple battery that generates electricity to power the clock. Each potato acts as an electrochemical cell, converting the chemical energy stored in the metal strips into electrical energy. Two potatoes are required to produce sufficient electricity to operate the clock. 2. A cell functions due to the chemical properties of the metals used (in this case, copper and zinc). These differing properties cause electrically charged particles (called ions) to move between the two metal strips, creating an electric current. The potato provides the medium that allows the current to flow while preventing the metals from touching. The electric current also travels through the wires connecting the zinc and copper strips to the clock, enabling the clock to function. 3. The potato can be replaced with other fruits such as lemon, orange, or tomato. Package List: 1 x Digital clock 1 x Light bulb 6 x Zinc/copper plates Notice: Please allow 1-3 cm variation due to manual measurement. Colors may vary slightly due to differences in screen displays. Features: and high quality. Ideal for educational and fun learning experiences. Includes all components needed to experiment with green energy. Comes with digital clock, light bulb, zinc/copper plates, and connecting wires. Allows experimentation with various fruits such as lemon, orange, and tomato.