There are plenty of unboxing and "reviews" of these Airpods everywhere, but literally nobody really explain how Apple achieve the seamless pairing with the W1/H1 chip. People are only saying it's due to the W1/H1 chip. But how? I mean am I the only one who is curious how Apple did all of these even with old bluetooth 4.1 (as the Airpods will work with older pre Bt5.0 iPhones)?