https://support.apple.com/en-us/HT201466
I think it's some kind of Bluetooth, but it doesn't get picked up in regular Bluetooth connections, so I suspect it's some sort of custom Bluetooth implementation or low-energy BT or something? Not entirely sure. But it definitely does NOT connect to regular Bluetooth-compatible systems.
Thanks for your assist, but it doesn't look like this works... yet.
> Made for iPhone hearing devices connect to iPhone, iPad, or iPod touch so you can stream audio, answer phone calls, adjust settings, and more.
I guess if it's a power consumption low energy thing, it would make sense that it doesn't work with legacy bluetooth, but in that case the same low power tech should be available to non-hearing-aid bluetooth audio devices.