It functions just like any pocket calculator, but can be filled with water or any other type of electrolytic liquid. Equipped with a fuel cell, the water inside the calculator creates a chemical reaction with the zinc anode and cathode. This chemical reaction causes an electrical current, and presto, you can solve all those mathematical equations! The water-powered calculator can calculate for up to a month on less than a cup of water.
So whether you need it for school, balancing your checkbook, or figuring out how much to tip your waiter, this water-powered calculator can be taken anywhere without fear of running out of power. Get this "green" calculator for your backpack, pocket or purse.