1. No battery needed;

2. When water flows down, the LED will light instantly and automatically;

A. When water temperature is below 32degree± 2degree, Green color will show automatically;
B. When water temperature is between 33~41degree± 2degree, Blue color will show automatically;
C. When water temperature is between 42~45degree± Degree, Red color will show automatically;
D. When water temperature is above 46degree± 2degree, Red color will flash immediately;

3. This item will change its color by detecting water temperature.