I guess it was simply luck that the pair of hearing aids I purchased on-line last year connected directly to my non-Apple smart phone. They also connect to my new Microsoft Surface Pro laptop as soon as I turn it on…after pairing once the first time in the Bluetooth setting. I don’t notice any delay in an audio signal. Well, not actually luck. The description said they connected via Bluetooth but I assumed all new hearing aids connected directly via Bluetooth.
I can even use a cheap Bluetooth USB “dongle” plugged into my desktop but I really don’t listen to stuff on the desktop.
I retired after a career in electrical engineering at the National Bureau of Standards Radio division in Boulder, CO…at least that was the name before several later name changes.