It charges via USB-C, it does USB 3 data if you have the Pro.
> Now you can connect USB‑C gear like thumb drives, fast external storage, 4K displays, and microphones. And you can charge Apple Watch or AirPods from your iPhone.9
> Charge up to 50% in around 30 minutes10 with the 20W USB‑C Power Adapter (sold separately).
Seems like totally bog standard USB-C, just like the rest of their devices.
> Now you can connect USB‑C gear like thumb drives, fast external storage, 4K displays, and microphones. And you can charge Apple Watch or AirPods from your iPhone.9
> Charge up to 50% in around 30 minutes10 with the 20W USB‑C Power Adapter (sold separately).
Seems like totally bog standard USB-C, just like the rest of their devices.