With the light that is emitted from the integrated LED in this bath faucet, you will be able to easily tell if the water is hot, warm, or cold, without the risk of burning a finger or two.
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… this unique LED faucet will instantly show you the water temperature by changing colors. If the water is hot, the LED light will change red, if the water is cold, the LED light will turn blue, and if the water is right in the middle or lukewarm, the LED light will turn green.
(Image Credit: OddityMall)