This temperature sensitive water tap light designed to provide visual indication of water temperature. It does so by illuminating the water that comes out of your tap. The product built-in device for mini generating electricity, illuminated by water without battery, the light will go out when the water was turned off. The illuminated color will change according to the water temperature. LED Quantity:4 PCS LED Colour:Green/Blue/Red (Three colours) Material:Zinc Alloy Casing Colour:ABS Size:58MM*40MM*40MM Weight(N.Wú¬150g Regular Working hydraulic pressure:0.1-0.4MPA Regular Working water flow:100~200kg/hour. Blister packing size:145mm*46mm*97mm Size of export carton:464mm*322mm*302mm.