Water clock completely without batteries, as long as the bottle is filled with water in the back of the clock, it can clearly display the time and date, as long as it is a few weeks do not have to add another water. Water sources of electricity generation trigger chemical reactions inside. The periodic table of chemical reactions mainly before 20 metal elements, including heavy metals, environmentally friendly.
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Last update was on: January 23, 2023 8:53 am