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 temperatureAll 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 immediatelyNever be scalded again by entering a shower that is just too hot! LED light color change properly only when water pressure is enough and steady1. Product Features-High quality overhead shower head with built-in LED light-LED light is activated when the Shower head senses water flow-No batteries are needed-Style: Contemporary-Shower Head Material: Heavy Duty Brass-Shower Head: Rainfall-Installation: Wall-Mounted or Ceiling-Mounted -1/2" standard connector-Water Flow: 1.8 GPM per each function.-Water Pressure: 60 Psi.-Thread: 3/4" NPT for Inlet for Hot / Cold, and 1/2" NPT Outlet for each function.2. Package includes-8", Polished Gold LED Overhead Shower Head-1x Wall or Ceiling Mount Shower Arm