Very simple to use, just plug in and turn on. I think it is very cool the way it automatically adjusts the fan speed according to the air quality, and the light display according to the time. Used it during super bad wildfire smoke conditions with air quality index greater than 500, kept my inside super fresh. Everytime we opened the front door, the air quality number displayed by the purifier would jump up, the fan would kick into high gear, and the number would drop down to healthy levels very quickly. Highly satisfied for now!