Externally, the Series 2 bears a strong resemblance to its older sibling—but once inside, we find a set of ZIF connectors in place of the awkward press connectors of yesteryear.

And tucked away on the back of the display we find a whole host of control hardware:

Apple 343S00092

20211CP TD1628A

NXP 67V04 NFC Controller (also found in the iPhone 7 Plus)