16 - Inch 3 Color Water Power Big Stainless Steel Square LED Temperature Sensitive Rainfall Shower Head ,Chrome Finish Ys-1731 Turn on the fun in your shower just by turning on the water; LED lights will automatically light up and set the mood, Changes colors automatically based on the water temperature with no batteries Self-powered by a built in dynamo that takes advantage of the water pressure to create energy to light the bulbs.