SYLVANIA’s ECOlight LED Water Powered Shower Light is a fun eco gadget that will give you light in the shower, powered only by the flow of water through the gadget. Using a tiny water turbine, the flow of water produces enough energy to illuminate you when giving yourself a scrub.
The LED light itself is adjustable, so you can point it in any direction you want. As an additional safety feature, the outside edges of the ECOlight will change to red when the temperature goes above 41 degrees Celsius (105.8 degrees Fahrenheit), or go blue when the temperature goes below 25.5 degrees Celsius (78 degrees Fahrenheit).
Sure it doesn’t serve any particularly practical purpose, but it’s fun, easy to install and doesn’t need any batteries.
Source: OhGizmo