Most LED showerheads are also temperature sensors. With the use of a basic microcontroller that is also a temperature sensor, they can sense how warm the water is. When the water is cold, the light will be one color, but then as the temperature increases, the color of the light changes to indicate the temperature of the water. The color code for water temperatures is usually blue for cold, green for warm and red for hot. Some showerheads also have a flashing red setting for very hot water.
An LED showerhead is made with a number of LED bulbs that are strategically placed amongst the nozzles of the shower head. If you are familiar with LED , you may be aware that most of these rely on batteries for their power, however this is not the case with LED showerheads. Most using hydropower. This is good for the environment whilst also being economical. The force of the water rushing through the shower head powers small electrical turbines in the showerhead and this generates just enough power to make the lights work.
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