Sumerain International Group Sumerain's high quality LED Thermal Sink Faucets were designed to bring a modern and fun feel into any bathroom. With a built-in LED light and temperature sensor, enjoy watching this faucet illuminate and change colours as you change the water temperature. The visual appeal of Sumerain's LED show seek to not only entertain but also relax your mind and body. The LED light is powered by batteries, and will be activated once the water is turned on.