1.The built-in device can generate electricity without battery and any other power connecting to the water,when the water flows down,the led will emit light instantly and automatically. 2.This item is verified to 2 models by the LED light color: A.two colors(blue and red): a.If the water temperature is under 40 +(-)2 degrees Celsius, the blue color will show automatically. b.If the water temperature is above 40 +(-) 2 degrees Celsius, the red color will show automatically. B.three colors(green,blue,red): a.If the water temperature is between 0 and 29 degree Celsius, the green color will show automatically. b.If the water temperature is between 30 and 38 degree Celsius, the blue color will show automatically c.If the water temperature is above 39 degree Celsius, the red color will show automatically 3.Our products have excellent function in the area of water saving 4.In the connection of the top, a water saving and filtering system is put there. 5.Material:Zinc alloy LED Qty:4pcs N.W.:0.15kg , Size:58* 40(Dia)mm Gift box size:46mm*46mm*71mm Blister pack size:180mm*120mm*69mm G.W.:0.16KG Two kinds of packaging: 1.Carton(gift box) Size:390mm*202mm*314mm Qty/CTN:120PCS N.W.:15KGS G.W.:16KGS 2.Carton(blister pack) Size:464mm*322mm*302mm Qty/CTN:120PCS