Wasser trieb Calculator

Now we used our new water battery which can be used more than 3 years with 1 year guarantee, and we have the patent of the water powered product in China,Eourpe,USA,Japan and so on. Now in the marker have some other water powered product is the copy and only be used 1--3 month. this Water Powered Clock just need add some water to the tank can working, which can use 2 years or more, was designed in 2009.It fashion and embody the envionment dirrect ,it is the fitst choice to do as the gift.