This is a fantastic little machine. It has an auto mode and an eco mode. It will check the air quality every few minutes and then react accordingly (either remaining in 'sleep' mode or kicking on to purify). You can turn both of those off if you prefer. It also has an LED with varying levels of brightness, or you can turn that off completely as well. All in all I'd say it's definitely a competitor in the purifier market, and by a big household name that we all know. Recommend.