We welcome the new funky H20 Maxi Water Powered Clock! he 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, & enjoy free energy to tell the date & time. Add water when required, typically every 6 to 12 months. Features include large hi contrast display, showing date & time, all housed in a stylish transparent sphere.