Turn on the fun in your shower just by turning on the water, the LED lights will automatically light up and set the mood. They will even change colors automatically based on the water temperature. All this with no batteries, everything is self-powered by a built in dynamo that takes advantage of the water pressure to create the energy to light the bulbs. Auto Temperature Detected Light Color Change!The shower head will automatically change colors according to the temperature of the water. So you always know how the water will feel on your skin just by looking at it.>When water temperature is ≤90F, Green color will show automatically;>When water temperature is between 91F~105F, Blue color will show automatically;>When water temperature is between 106F~113F, Red color will show automatically;>When water temperature is above 115F, Red color will flash immediately.Never be scalded again by entering a shower that is just too hot!Feature: 1. 1/2" standard connector. 2. Easy to install and clean. Can be cleaned with mild soap to ensure the non-tarnish life shine. 3. Package include: (1) 16", Brushed Stainless Steel Shower Head