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. Water glows Red when water is Hot (temperature above 39°C). Water glows Pink when water is Warm (temperature is 32°C - 38°C). Water glows Blue when water is Cold (temperature below 31°C). 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. Fits all standard connectors, easy to install. Offer you a delight bath & a wonderful experience. Ideal for bathroom, to make it more fantastic. Get the CE & RoHS certificates. Specifications: Case Material: ABS electronickelling LED Emitting Color: Pink, blue, red Inner diameter of tube: 1.9cm Outer diameter of tube: 2.5cm