You may be puzzled with the water temperature unless you touch it, with this device, this problem is solved. Faucet LED light changes color based upon the water temperature.  Watch the beautiful rippling light fill a dark bathroom as soon as you turn on the faucet.  We often prefer this soft lighting effect to turning on the bright white bathroom light when it is not needed.  It's "blue" when the water is cold or simply turned "on."  When the temperature reaches 89 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!

Specifications:

• Works on most USA faucets and includes "universal adapters" for 95% coverage of average faucets.
• Low cost adaptors are usually available for unique faucets at local hardware stores.
• Tiny button batteries (type LR44) are included along with an extra set.  
• Fits most standard faucets in USA.
• These faucet adaptors may be useful and are commonly available at hardware and plumbing stores 15/16" - 27 male thread or 3/4" - 27 .
• Not recommended for faucets outside of the USA.