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. 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 31°C), LED light color will be Green; Warm water (temperature between 32~38°C), LED light color turns Blue; Hot water (temperature between 39~45°C), LED light color turns Red; When the water temperature is higher than 45°C, the Red light will start flashing, which means that the water is too hot and please be careful. PS: The temperature error of these data can be about 5%.Specifications: Case Material: ABS electronickelling LED Emitting Color: Green, blue, red External thread diameter: 2.0cm Item size: about 22 * 8.8 * 3cm (Length * head diameter * handle diameter) Item weight: 181g Package size: 28.5 * 9 * 6cm Package weight: 236gPackage including: 1 * LED Shower Head