Claire's Eco Store brings you the H2O long life Maxi Clock. The H2O water powered Maxi clock uses the latest long life H2O technology to power this large display clock. Simply add water to the body of the clock to activate it, and enjoy free energy to tell the date and time. Add water when required, typically every 6 to 12 months. Features include large hi contrast display, showing date and time, all housed in a stylish transparent sphere.