Features: No batteries and external power supply, it will illuminate after water flows down. The sensitive shower head light will change colors according to the temperature of water. The color's change remind you the water's temperature. The Shower has 3 modes, universal mode, atomizing mode water-column mode. ABS electronickelling material, excellent corrosion resistance, durable. Transforming the stream of water into a beautiful waterfall of light. Brightness is such enough even no other lighting fixtures need. Offer you a delight bath a wonderful experience. Ideal for bathroom, to make it more fantastic. Get the CE RoHS certificates. LED color automatically changes according to water temperature: Cold water (temperature below 31C), LED light color will be Blue; Warm water (temperature between 32~38C), LED light color turns Green; Hot water (temperature between 39~45C), LED light color turns Red; When the water temperature is higher than 45C, the Red light will start flashing, which means that the water is too hot and please be careful. PS: The temperature error of these datas can be about 5%.