... the certificate7. This model of product is equipped with switch which can not only turn the led lghts on ... water flows down, the LED will light instantly an automatically;When water temperature is ≤32°C,Green color ... between 33°C-41°C,Blue color will show automatically;3).When water temperature is between 42°C- ... 45°C,Red color will show automatically;4).When water temperature is above 46°C, ...