llumisink light-up sink attachment turns your sink into a multi-color light! It fits almost any faucet and changes color based on temperature. Red for hot; Blue for cold; and Green for warm. Simply twist off your current faucet head and put on your Illumisink for a fun & illuminating experience. No Batteries needed since the Illumisink generates its own power right from your running water. How cool is that?! It even comes with a 100% lifetime guarantee.