1.As the built-in device generating electricity
without the battery and any other power
connets to water, LED will emit the light.
2. This model of product is equipped with
switch which can not only turn the led lghts
on but aslo can switch them off when it
connects with water source ,meanwhile it
also has 4 kind of working modes,red
mode,green mode,blue mode and rainbow
mode, which you can choose