I love my AromaTech diffusers. The app used to allow the user to select settings for the scent to come on and off. For example, on for 30 seconds-off 120 seconds… versus selecting the preset 1 to 9 setting. As a user, I got it down to a preferred setting (science) - then Aromatech did an “UPDATE”! It removed the password, albeit annoying, it was fine. Then it gives a prompt only for the AromaMini BT, and not their AT600. Which only after reaching out via chat, was told that you have to open the unit, hit the “reset” button & you lose all your previously stored settings. So if you have a few around your house (like I do) - then you have to do a few resets and reprogramming of each. (That was a bit annoying!) I don’t understand what the UPDATE is really meant to do. They removed things that made this bluetooth feature appealing. I don’t need the darn bluetooth other than setting a time for it to come on and off now. I can set intensity on the unit itself. What a waste of technology “update”!