Using plain tap water for the power source, this Water-Powered Desk Clock and Calculator Set are full-functioned. Forget about wires or batteries - a few drops of water is all it takes. This amazing Water-Powered Desk Clock displays the time, month, and date in an easy-to-read LED display. Columns on the back of the clock hold water - a built-in energy converter pulls electrons from the water to create a steady stream of current to power the clock. Keep columns open to create a bud vase! Store the H2O converter for the Water-Powered Calculator in its dry state until you're ready to use it. Just add water...and you'll be ready to number crunch. Large keys and an easy-to-see 12-digit display.