This high tech rain shower head powers the LED lights using a built in hidden dynamo. The lights will automatically turn on when water pressure is turned on. The lights will dim and brighten when you lower and raise the pressure. So you can set the perfect mood, water and light. Auto Temperature Detected Light Color Change. The shower head will automatically change colors according to the temperature of the water. No Batteries. Modern Stylish Design. Completely polished chrome made to match or stand out from your other bathroom fixtures. Standard size. Replace your old shower head with this exciting new product. The threading is universal so it will fit any standard shower head. This high tech rain shower head powers the LED lights using a built in hidden dynamo.More LED Multi color showers you can buy.