I found this review for the device, the company has gone bankrupt that made this device.

The app used to work, but now it only says, "Oops, something went wrong" every time I try to open the app. I now have no control over my purifier, and it is stuck searching for a WiFi connection, so it is VERY noisy ALL the time. Please fix your app. The same issue occurs on everyone else's phones in the house, so it is not my phone that is the issue.   

Because the company is out of business, you will not be able to buy replacement hepa filters.   This is basically a one time use filter at this point.  

Brand new in the box.   It retailed for 500$ when it was released.  I've discounted it for the reasons above.

shelf 11