No batteries and external power supply, it will illuminate after water flows down. Automatic light switching. 7 color are displayed automatically when water flow. Main colors are Green, Red & Blue. ABS electronickelling material, excellent corrosion resistance, durable. Transforming the stream of water into a beautiful waterfall of light. Brightness is such enough even no other lihting fixtures need. Fits all standard connectors, easy to install. Offer you a delight bath & a wonderful experience. Ideal for bathroom to make it more fantastic. Get the CE & RoHS certificates. Material:Copper electronic kelling LED Quantity: 6 LED LED Emitting Color: Green, blue, red,etc Inner diameter of tube: 1.35cm Outer diameter of tube: 2.0cm (common interface) Item Size: Approx. 200* 15* mm Weight: 1000g Multiple color(jump changing) LED lighting color:Multiple color(gradual changing) Product feature: 1,When water flow down,the LED will light instantly and automatically; 2,It is bright enough so that there is no need other lighting fixtures. 3,The LED color will change gradualy and automatically. 4, The change of LED color will not be subject to the temperature of water RGB color(temperature detectable) LED lighting color:Blue/Green/Red(temperature detectable) Product feature: 1,When water flow down,the LED will light instantly and automatically; A,When water temperature is 31centigrade,Blue color will show automatically; B,When water temperature is between 32centigrade-38centigrade,Green color will show automatically; C,When water temperature is between 44centigrade-50centigrade,Green color will show automatically; D,When water temperature is above 51centigrade,Red color will flash immediately; 2,This will change its color by detecting water temperature.