I sleep much easier now, it works silently, a pleasant, barely noticeable sound, like being in the forest. I like it. Today, when we started using the fireplaces, the air was very, very dirty, the indicator was red. After I returned home and turned on the purifier, after about 1 hour the air cleared to a value of 00.1 (the indicator turned blue) and it became easier to breathe. An essential element for your health. I always have it on automatic.

Excellent automatic operation and accurate indication of 2.5 ppm. In cooking or spray use (aerosol type), it increases to the maximum and gradually decreases.
At maximum speed, it naturally makes noise but it is a soft white noise, it is common, and it is when you want to quickly reduce particle levels. However, for normal use and spaces, settings 1-2 are fine for 24-hour operation (they do not bother) and for night time, it has a night mode that is really quiet for sensitive individuals.
The filter has a cleanable (with a vacuum cleaner) mesh, it needs cleaning approximately every month. In my case, after 3.5 months, the filter has reached 50% with 24-hour use in an 80 sqm house, you can see it through the application that takes into account the usage time and the specific load of the space. In the application, you can also see a chart of the variation of pm 2.5 values over time and fan speed. A very good purchase.