HGD&reg;Self Power Water Powered Temperature Control Sensor Water Glow RGB 3 Colors Changing LED Faucet 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 Color's change remind you the water's temperature. Water glows Red when water is Hot (temperature above 44C).