We extract the I/O daughterboard. There's lots of ingress proofing in evidence here, including the speaker grille surround and the tiny seals on the USB Type-C connector and headphone jack—all part of that IP68 rating.

The headphone jack itself remains a modular affair—good news for repairability, as this is a high-wear component.

This daughterboard also houses some antenna tuners and likely a Semtech SX9320 proximity sensor.