New and Improved! Now Faucet Light changes color based upon the water temperature. It's "blue" when the water is cold or simply turned "on." When the temperature reaches 89º F, it changes to "red," alerting you that the water is getting "hot"! Fun and functional, it's ideal for the kid's bathroom and a smart gift for older people, too! Works on most USA faucets and includes "universal adaptors" for 95% coverage.