This LED tap changes in real time according to temperature every 1 to 3 seconds to achieve a colorful and changing light effect. This product has a small power source that does not need to be powered by a battery. It emits light as long as there is a jet of water. When the water source is switched off, the lamp goes out immediately. The light colour may change depending on the temperature. 3 colours colourful: 3 colours (blue, green, red) of the LED tap are automatically displayed when the water flows, without batteries or external power supply. It will appear blue when the water temperature is below 32 degrees, green when the temperature is between 33 and 41 degrees, red when the temperature is between 42 and 45 degrees and when the temperature is above 46 degrees. The indicator flashes red when the temperature is set. Convenient to use: changing the light colour reminds you of the water temperature and is very convenient and convenient to use. Wonderful experience: easy to install and lights up when you turn the tap, offering you wonderful joy and experience. Widely used: transforms the water flow into a beautiful light cascade. Perfect for use in bathroom or kitchen.