Rely on hydraulic drive generating their own power, No need for the power supply, safe and environmental. The color"s change remind you the water"s temperature: Water glows Green when water is cold (temperature below 31°C). Water glows Bule when water is warm (temperature between 32°C-43°C). Water glows Red when water is hot (temperature between 44°C-50°C). Ideal for bathroom or kitchen to make it fantastic. Get the CE & RoHS certificates. Direction for use: Firstly, take off net from tap screw thread. Secondly, install LED faucet light screw thread. Thirdly, usage of adapter screw thread inside universal adapter. Specifications: Case material: ABS chroming LED emitting color: blue,green,red Internal thread diameter: 2.2cm Outside diameter of tube: 2.8cm Item size: 4.7 * 2.8 * 2.8cm Item weight: 90g Package size: 13 * 6 * 4cm Package weight: 91g Package including: 1 * LED light faucet 1 * M24*1mm Outsidethread adapter 1 * M20*1mm Outsidethread adapter