... .When water flows down, the LED will light instantly and automatically;A. When water temperature is ... .When water flows down, the LED will light instantly and automatically;3.Brightness is such enough ... .When water flows down, the LED will light instantly and automatically;3.Brightness is such enough ... light system inside of the LED SHower head 3: 4.5V LED rainshower,stainless steel shower head,light up ...