LED Faucet Light 1 LED Red/Green/Blue No Battery. The LED Faucet will change colors based on water temperature. The LEDs are powered by the water. Includes alumunin adapter to fit most sinks. When the water temperature is below 30 degrees the color is green, between 30 to 35 degrees the color is blue, and at 35 to 45 degrees the color is red. When the color is higher than 45 degrees it will be flashing red. This device will illuminate when water passes through within a 0.1 to 0.4MPA. This product measures approximately 2.22 inches by 1.61 inches 1.18 inches.