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、A. When water temperature is ≤28℃, Blue color will show automatically;
B. When water temperature is between 29℃～36℃, Green color will show automatically;
C. When water temperature is between 37℃～43℃, Red color will show automatically;
D. When water temperature is above 44℃, Red color will flash immediately; 
4. 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.