1.As the built-in device can generae electricity without battery and any other power conneting to the water, when the water flows down the led will emit the light instantly and automatically. 2.This generation is verified to 3 models by the led light color: A.Single color(available colors:blue, green, red, yellow, purple, white). B.Rainbow color:one of the light color every 3 to 5 seconds changes so that the rainbow colors are showing gradually. C.Color changes by detecting the water temperature: A. When water temperature is below 32 degree celsius, green color will show automatically; B. When water temperature is between 33 and 41 degree celsius, blue color will show automatically; C. When water temperature is between 42 and 45 degree celsius, red color will show automatically; D. When water temperature is above 46 degree celsius, red color will flash immediately; 3.The light is so bright that there is no need with any other lighting fixtures during the bath. 4.Two functions are available for the water flow which can form not only the inner-ring cross but also the outer-ring diffusion. 5.Casing material:abs plastic led qty:12pcs Net weight.:0.18kg casing color:metalic Surface treatment:electro-plated(cu, ni, cr) Size:100(d)mm 1.Gift box measurement:100*100*100mm 2.Export carton measurement:520*420*320mm Qty/carton:60pcs n.W.:12.6kgs g.W.:14kgs