1、This little device fits on most taps and lights up a set of LEDs when you turn on the tap. Transforming the stream of water into a beautiful waterfall of light. 2、The sensitive faucet light will change colors according to the temperature of water. 3、The color's change remind you the water's temperature. 4、Water flash red when temperature is above 45°C. 5、Water glows Red when water is Hot (temperature 43C - 45°C). Description: This little device fits on most taps and lights up a set of LEDs when you turn on the tap. Transforming the stream of water into a beautiful waterfall of light. The sensitive faucet light will change colors according to the temperature of water. The color's change remind you the water's temperature. Water flash red when temperature is above 45°C. Water glows Red when water is Hot (temperature 43C - 45°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) Direction for use: Firstly, take off net from tap screw thread. Secondly, install LED faucet light screw thread. Thirdly, usage of adapter screw thread inside universal adapter. (adapter screw thread not included). Note: Automatic generation without batteries. When the water temperature is appeared between two temperature range, the color will lights flickers, for example when the water temperature is 43℃, the color will light flickeringly between red and green Pacakge: 1* Water Faucet Tap