- No battery needed;
- When water flows down, the LED will light instantly and automatically;
A. When water temperature is below32 celsius degree, Green color will show automatically;
B. When water temperature is between 33 and 41 celsius degree, Blue color will show automatically;
C. When water temperature is between 42 and 45 celsius degree, Red color will show automatically;
D. When water temperature is above 46 celsius degree, Red color will flash immediately.
