No batteries and external power supply， it will illuminate after water flows down Automatic light switching. 7 colors are displayed automatically when water flow Main colors are Green， Red & Blue. ABS material， excellent corrosion resistance， durable Transforming the stream of water into a beautiful waterfall of light. 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 certificatesSpecifications: Case Material: ABS Main LED color: Green， blue， red External thread diameter: 2.0cm Item size: about 20 * 8 * 3.3cm (Length * head diameter * handle diameter) Item weight: 159g / 5.6ozPackage Content: 1 * LED Shower Head