The Sylvania LED Ecolight Water Powered Shower Light is a great way to bring some light into your shower without having to do any wiring. The LED light is powered entirely by the flow of water. It also includes a water temperature sensor which will light up either red or blue depending upon the temperature (that’s the ring of color around the outside of the shower head). It has an on/off switch in case you’re not feeling the light one day. It attaches to any standard shower head quickly and easily.