Led color change Shower Head1 No battery is needed,.2 When the water flows down, the LED will lightinstantly and automaticallyIf the water temperature is under 15, the LED Shower Head light will emit green light.If the water temperature is between 16 25, the LED Shower Head light will emit blue light.If the water temperature is between 26 35, the LED Shower Head light will emitpink light.If the water temperature is between 36 45, the LED Shower Head light will emitred lightIf the water temperature is above 46, the LED Shower Head light will flash with red and blue light, which warns you should be careful!.3 Thisitemwill changeits color by detecting water temperature.