Pour yourself a glass of juice and start reading your new H2O digital clock. Edu-Toy H20 Clock runs on the electricity generated as your copper and zinc electrodes experience electrolysis in the fluid they are resting. The H20 Clock kit comes complete with everything to build an actual chemical battery that works and powers a digital clock. Includes clock module and base, zinc and copper electrodes wire connect springs and more. This clock requires no batteries! A fun and EDUCATIONAL way to power your clock!