1.No battery needed, self water powered, when the water flows down the led will emit light instantly and automatically. 2.This generation is verified to 3 models by the 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 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.Casing material:abs plastic led qty:12pcs Net weight.:0.23kg casing color:metalic Surface treatment: electro-plated(cu, ni, cr) Size:230*50*88(d)mm 1.Gift box measurement:130*66*295mm Weight:0.33kg 2.Export carton measurement:545*345*375mm Qty/carton:30pcs N.W.:12kgs g.W.:13kgs