Color-changing LED Faucet Warns You of Impending Burning,Glow blue and red to warn you of the temp it changes color based on the temperature, making you feel like you're doing the dishes with either antifreeze or Gatorade. It's a cool concept, as you won't have to worry about scorching your hand while testing the water again. If it's red, don't mess with it The LED isn't variable:once you hit 89 degrees or greater, the red LED switches on. before that . its blue . And when your water isn't running the circuit opens and the light goes es with two adapters for dirrerent faucet size