1.As the built-in device generating electricity without the battery and any other power connets to water, LED will emit the light.  
2.Two functions are available for the water flow which can form not only the inner-ring cross but also the outer-ring diffusion. 
3.The built-in flow regulating valve can control water pressure effectively and  improve the service life of motor hugely, as well as save water. Besides, the filter screen designed inside the flow regulating valve can filter the impurities in water, improve water quality and protect the motor rotor from being damaged.                                                                                                                          4.In the mode of  color-changed with temperature, color are changed as followed .
A. When water temperature is ≤32℃, Blue color will show automatically;
B. When water temperature is between 33℃～41℃, Green color will show automatically;
C. When water temperature is between 42℃～45℃, Red color will show automatically;
D. When water temperature is above 46℃, Red color will flash immediately;