1ã€As the built-in device generating electricity without the battery and any other power connets to water, LED will emit the light.
2ã€When water flows down,the LED will light instantly and automatically by the water temperature;
A. When water temperature is between â‰¤39â„ƒ, Blue color will show automatically;
B. When water temperature is above 40â„ƒ, Red color will show automatically;