Waterfall spout and built-in Led,changes its color by detecting the water temperature: Blue - cold water(030degree(s)C) Green - warm water(3142degree(s)C), Red - hot water(4352degree(s)C) Extremely hot water-Red warning light flashes on and off to avoid scaldingSingle hole bathroom sink faucet is easy to install with a 6"" deck for 1 or 3 hole sink installation, standard 2 supply lines.One lever handle makes the temperature and flow rates change in an effortless wayLed lights powered by 4pcs Aa batteries (batteries not included)