3-color temperature sensor: The color changes according to the temperature of the flowing water. Blue - cool below 89F (0-32), green - warm 89-100F (32-38), red - hot 102-113F (39-45), flashing red warning heat over 113F (45) br>Top Quality Rain Shower: Modern stainless steel back with polished chrome finish for excellent rust resistance and durability. Make your bathroom look bright No power supply: No batteries and external power supply required, the light is activated by water pressure and automatically shuts off the water Easy to install: No tools required to install, the shower head fits a 20mm diameter screw slide. Just turn off the existing shower head and replace it with a new one. Very safe to use, water flow and circuit separation No leaks relax: the mixture of light and water will relieve your stress