Yes, for certain functions you even have to. You can find everything and a little more in the description on Digitec:

Ventilation recommendation if air quality is too poor (coloured background lighting). For a more precise measurement of the air quality, more power is needed, which is why the air quality is only displayed in operation with a power supply unit. The ventilation recommendation can also only be given in mains operation, in battery operation the time, temperature and humidity values are visible.