... generating electricity,illuminated by water without battery,the light will go out when the water was turned off ... will charge its color by time The light can change one color every 1 to 2 seconds so ... 1).When water flows down, the LED will light instantly an automatically;When water temperature is ≤32°C ... was turned off. 2 ,it can only emit one color light,Green,Red,Blue,Yellow,purple for your choice. ...