This glow temperature sensor discoloring LED water stream faucet tap fits on most taps and LED light will light up when you turn on the tap. 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 Blue when water is cold (temperature below 31°C). Water glows Green when water is warm (temperature between 32°C-43°C). Water glows Red when water is hot (temperature between 44°C-50°C).The temperature error of these datas is about 5%. 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 electrochromism LED emitting color: blue, green, red External thread diameter: 1.5cm Item size: 10.5 * 3.2 *3.2cm Item weight: 85g Package size: 13.5 * 6 * 5.8cm Package weight: 111g Package including: 1 * LED light faucet