Faucet Head Colors/Temperature - GREEN; <=29 deg C - BLUE; 30-38 deg C - RED; >39 deg C Primary Function: Faucet head with water temperature indicating LED light Fitting Size: Fits 24.4mm and 21.8mm diameter faucets (3/4 and 1 inch). Please note that an extra male/female threaded adapter may be required for some faucet installations. This should be bought separately from your local hardware store. Uses the water pressure to power the light - no need for batteries. Easy retrofit installation, just twist off your existing faucet head and replace with the new one Did you think you couldn't make something like your water faucet fun? Well, when water runs through this one, it lights up! A treat for both the young and old alike. Please note that an extra male/female threaded adapter may be required for some faucet brands. This needs to be bought separately from your local hardware store Certification: CE, CCC, RoHS
It's amazing to see it working, but it's more when it changes light from green to blue and then red depending on the water temperature. It only needs to be adjusted to the suitable faucet.
Especially in the dark it's magic !
I recomend thiw product.