The controller achieves these different humidity/temperature environments by changing the amount of power supplied to the Sauna heater or Steam Generator
Each switches between the amount of: Temperature (minimum to maximum) and,Humidity (Percentage of time the steam generator is working) You will notice that the more the steam generator is operating the lower the maximum temperature you will be able to set. The reason for this is that the more water-moisturehumidity in the air, the more contact of the heat to your skin.