He has 3 stages that couple air flow / heat. The low level is slightly warm at low airflow, but he has not the hotter / slightly screeching noise of most other Hair dryer, very good.
The middle level has a good heat output with quite strong air flow, such a strong airflow would you not have expected a mid-range device.
On the high level of the air flow is again slightly stronger at fairly high temperature, which is only useful if it even has to go very fast, sensitive users will likely use this level only by holding down the cool air button, then you have significantly absenkte temperature with high air flow, almost as strong as in professional appliances.
A total surprise this affordable hairdryer, he has the professional all genes.
The professional hair dryer Caruso then begins just where the little stops. The small produces a neat strong wind, the Caruso storm to hurricane force. The blow-drying is then again at least twice as fast, but really need not do that actually, the small can do everything very well.