Electricity is generated with the water and the temperature activates different leds.
Pretty cool if your water system is so powerful that you can burn yourself when you're too tired to think before you walk under the shower.
It starts as green for temperatures below 32ºC; blue from 32ºC to 40ºC (which apparently is how I like to shower); violet from 40ºC to 45ºC and red for insanely hot water. I mean, for temperatures over 45ºC.
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