I have been using this air purifier for a few days, it's really quiet, I usually use auto settings, and I can only hear the fan noise when I press my ear to the purifier, a feet away and there is no sound. The led illumination ring at the bottom is a nice touch, and it makes it looks good in the dark. The sensor will detect the quality of the air and make the fan spin faster if needed. . This air purifier offered a viable solution in removing the stuffy air and pollen. Within the first night, I noticed a difference sleeping easier, removing the particles that has been circulating throughout my home. The buttons are very convenient and also feels high quality.