The listing, LED Temp Sensing Water Faucet Light - NIP has ended.
This little device fits on most taps and lights up a set of LEDs when you turn on the tap, transforming the stream of water into a beautiful waterfall of light. The sensitive faucet light will change colors according to the temperature of water:
Water glows Blue when water is Cold (temperature below 31°C).
Water glows Green when water is Warm (temperature is 32°C - 43°C).
Water glows Red when water is Hot (temperature is 44°C - 50°C).
As an extra safety feature, water FLASHES Red, alerting you when water is 51°C or above!
No batteries or external power supply needed - this is hydropowered! All parts included.