LED light color: Blue/Green/Red ( Temperature detectable ) When water flows down, the LED will light instantly and automatically; When water temperature is below , BLUE color will show automatically; When the water temperature is between to 40 degrees, GREEN color will show automatically; When the water temperature is between 41 to 45 degrees, RED color will show automatically; When the water temperature is higher than degrees, RED color will FLASH immediately; Feature - ColorGrey - Material: ABS - Size: 2.4 x 2.4 x 3.5cm - Turning the stream of water into a beautiful blue waterfall of light. - Temperature control Led light changing helps you to know the water temperature. You don't need to try it with your hand,avoid cold and hot, more safe - Made of ABS material with excellent corrosion resistance. Both fantastic and durable. - The light is activated by water pressure and turns off automatically with the water. - Built-in externally threaded connector with internally threaded adapter. Suitable for a variety of faucet interface, and Can be installed easily within minutes just by screwing in it. Package list: 2 water faucet