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 44°C). Water

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 44°C). Water glows Green when water is Warm (temperature is 32°C - 43°C). Water glows Blue when water is Cold (temperature below 31°C). ABS electrochromism 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