1.No battery needed, self water-powered with the built-in generating device.When the water flows down, the led will emit light instanyly and automatically.
2.The led light color changes by detecting the water temperature:
    a.when the temperature is below 32 degreen celsius, the green color will show;
    b.when the temperature is between 33 and 40 degree celsius, the blue color will show;
    c.when the temperature is between 41 and 45 degree celsius, the red color will show;
    d.when the temperature is above 46 degree celsius, the red light will flash immediately.
3.This product  is energy-saving (not only because they are no battery needed, but also because the led light is so bright that there is no need with any other lighting fixtures during the bath. ) and eco-friendly ( all the materials are pollution-free and do no harm to the human body, and have long life-span).
4.The product is water-saving, the regular working water out-let 4L~8.4L/ Minute.
5.Material:ABS     LED Qty:12LEDs      Net W.:0.21kg     Size:257*40*97(Dia)mm
    Regular woking water pressure: 0.1~0.6MPa