the new faucet need not battery, it clear itself
The faucet experience is so boring. Clear water, always the clearwater. What if you could have a party in your faucet? Turn the wateron, and the running water activates the LED Faucet Light, making thewater look bright blue.
Andnow with the new Temperature Controlled Red LED Faucet Light, when thetemperature reaches 89 degrees the light source will magicallytransform from Blue to Red. 
Now what does the new and improved Faucet Light really do for me?
Well,think of the new Red LED Faucet Light as a good warning sign for you orpossibly your children.  Once the water becomes too warm (over 89Degrees), the Red Faucet Light will be the latest beacon of childsafety in your house.
Plus, like always, the LED Faucet Light looks so cool!
You can also use the Faucet Light as an additional light source for doing sexy dishes or adding some pizzazz to the bathroom.
The Faucet Light  will impress all your family and friends.  It's a must have piece of unique home decor.
 
LED Faucet Light Features:
Water pressure activation of the light source.
Light goes off when water is turned off.
Long lasting bright Blue and Red LEDs.
Fully enclosed battery pack included.
Universal adapter (included) fits most water faucets.
About 2.25" long.
Installs in less than a minute!