Product Name: Environmentally Friendly Water Energy Clock Size: 88*82*77MM Weight: 80g (excluding packaging) Power Supply Mode: Water Power Supply Working Principle: The water energy clock does not require batteries. Simply fill the container on the back of the clock with water, and the time and date will be clearly displayed. The clock can operate for several weeks without refilling. The electricity is generated through a chemical reaction triggered by water. This reaction primarily involves metal elements from the top 20 of the periodic table. The product does not contain heavy metals and is harmless to the environment. Instructions: This product works normally by adding tap water. If the display becomes dim or disappears, add water or other non-corrosive liquids until the liquid covers the positive and negative electrodes inside the container. Note: Personal preference may allow for the addition of different types of safe, non-corrosive liquids.