The brand new water powered can shaped clock uses the latest long life H2O technology to provide the power for this innovative clock.The brand new water powered can shaped clock uses the latest long life H2O technology to provide the power for this innovative clock. The clock will last between 6 - 12 months before you need to add more water. You simply add water to the body of the can to activate it, and enjoy this free source of energy to clearly see the time. A great way to introduce children to hydro power.