I realize you wouldn't be showering in the dark, but I wanted you to be able to see how the LED lights change color as the water temperature changes. I received a free product for review purposes.
Color of LED lights changes automatically according to water temperature:
BLUE - Cool under 95F (35C), GREEN - Warm 95-108F (35-42C),
RED - Hot 109-122F (43-50C), FLASHING RED - Warning Hot over 122F (50C)