designer's own words:It is a small waterpower generation by using the way connected itself with a faucet. It generates by the pressure of water from a faucet. It has two functions. The first one is that it can measure the quantity of water you used in a day. You can set the quantity that how much water you will use a day and check it. When you use too much water that you set, it will alarm. The other function is that you can listen to a radio when you use water or whenever you want. When you use water, it can make the electricity. And it is controlled by the analog type in order to save the energy for working. We want people to know that how much water they used and recognize that to conserve our environment is a pleasant thing like that you can listen to a radio by the energy you produced.