The shower head only has blue light, the color can not changed by water temperature as soon as you open water, the blue light will work, only when you close water, then the blue light will off work. 3 handle/knob for different function, it is not thermostatic mixer valve. This product not need any battery or other 110V/220V power input, The LED and Temperature display.By water flow, There is a motor inside the product, When there is enough water flow through the motor, it will generate a safe power supply for LED and Digital display. Cold and Hot, LED Light. Bath & Shower Faucet Type. Shower Panels, shower Column Shower Faucet Tower. 3 Handles Brass Mixer Valve. 6 water outlet Shower Functions.