Worst air purifier I have ever bought! And I didn't buy one, I bought 6 different units. After a year I can tell you they are not worth what they say, the app opens work, the units disconnect at least once a week, they don't let you ljnow when is time to change your filter, autor refill wont get there on time since they use an estimate, if you over use you unit you will have to call them and let them know so they can ship it earlier (what is the point if having this units) will not recommend to anyone
Ohhh and they took my review down from facebook (crooked companies)