Built-in hydro-powered device powers the LED lights, which provide visual shower temperature cues to reduce water waste. The lights will dim and brighten when you lower and raise the pressure so you can set the perfect mood, water, and lighting. When the water temperature is ≤89 °F (≤32 °C), the Blue color will show automatically; When the water temperature is between 97 to 107 °F (36-42 °C), the Green color will show automatically; When the water temperature is between 109 to 122 °F (43-50 °C), Red color will show automatically; When the water temperature is above 122 °F (>50 °C), Red color will flash; When water temperature is above 122 °F (>50 °C), Red color will flash immediately.
FontanaShowers® Complete Bathroom Shower System Description:-