The Water-powered Radio is exactly what the name suggests. Just connect it to your shower and viola! You have a Radio in the shower that is powered by the flowing water. It uses a patented technology that generates power by using the water flow to turn an internal turbine. 

No, you don't need to continuously run the shower to listen to the radio. It will run for a while after the water flow stops.

Price : Rs.1995

http://www.myecoday.com/Products/myeco-Home/POWER-plus/H2O-Shower-Radio/pid-1588969.aspx