TL;DR: someone could make bank selling This is semi OT. I use a hearing aid every day. the hearing aid features are turned off, i just use it for bluetooth streaming and phone conversations. it is a receiver in canal hearing aid, and I've put a non-occluding ear dome on it so I can hear normally with it in, but when I play music, the music just arrives in my ear. its also very discrete, people dont notice it unless i tell them its there.
Why someone doesn't take a cheap android/iphone bluetooth-compatible receiver in canal hearing aid and sell it not as a certified hearing device (heck, disable the hearing aid part in sw) but as a discrete wireless headphone set is a mystery to me.
Wireless headphones give me earaches with pressure on my ear canal, over the ear headphones give me headaches with pressure on my ears, then glasses, then skull. Custom in-ear monitors conform to my ears just fine but block out most other sound and have wires to deal with.
These? I put them in, forget about them for a long time, and have sound just floating into my ears when I turn on music.
It's my go-to startup idea.