This is the new and improved version of the temperature controlled faucet light. The light changes color according to the water temperature. A great gadget to install in a bathroom that is used by children. When the water is hot the light will be red and when it is cold the blue light is activated. When the water is a medium temperature (between 33 and 43 centigrade) the light turns green. An excellent idea that can help to guard against accidental burns from hot water. It can also be used for decorative purposes when you want to add an extra special touch. It makes the water appear colorful which looks really cool!