What is the effect of top spraying water in the video?

Beautiful

China has a wide area, and there is a huge difference in water quality between the north and the south! The author wants to really solve the Chinese people's demand for constant temperature showers, or to experience life in depth!

Original is cow

Great original works

Constant temperature shower is good, not afraid of scalding of children and the elderly.

I feel a little bad

May I ask if this is based on the temperature control of the water, or is it just an adjustment button indicating the temperature range?

The picture is super great