The air purifier is light and easy to move around with option from both the touch screen in the front of the device or through the Mi app. The noise level on sleep mode is not audible to the point i had to check it was still switched on. The app is not required to operate the device but even so it was easy to set up the device with the app. Accessing the replaceable filter is very easy to do by removing the rear panel. Filter indicates in the user guide that it will last from 6 to 12 months although the apps has started to count down from 146 days.