on the hearing aids themselves. Easily and quickly done on the fly in less than a second or two. And almost invisible to people around you; looks like you're scratching your ear. Also, whenever I have mentioned to someone that I was wearing them, they always tell me they had absolutely no idea. Even when I point them out most people have trouble seeing them. However, I have realized one real downside this past year or so; wearing a mask along with your glasses and your hearing aids can be a real disaster as everything can get tangled up. I'm mean how much space do we have behind out ears!!! And if anyone here wears an erring as well....you just might end up electrocuting yourself.
I have to say before the 9's, I was constantly adjusting programs. But with the exceptions of those times where I purposely force the music program to happen - these things have been pretty much set and forget. The main program is basically adaptive and internally switches programs based on what it is "hearing". And so far, that's just pretty much worked for me. (and that includes them now being both ear piece and microphone for my iPhone - which is working just seamlessly. Answer the phone or push a button on the aid and talk - afterwards hang up and the aids go back to what they were doing).
Which I think gives real hope for the even older person that isn't going to be up to fiddling with them all of the time. I think many old people could use them with only barely knowing about the buttons on the aids without ever having to use the app or different programs or any of that.