> "magic"

They're on an proprietary extension of Bluetooth, standard compatible but closed to their devices. They usually don't talk much about it, Phil Schiller was the most explicit I think (it was about the airpod's W1 but it's the same deal)

https://www.theverge.com/2016/9/7/12829190/apple-w1-chip-iph...

> Apple’s Phil Schiller described Apple’s move to a new wireless chip as “fixing the challenges” of wireless audio