USB-C charging is standard and convenient, with common notes that it can also provide power out to other devices. Some mention taking care to dry the USB-C port before charging after water exposure.
USB-C charging is consistently confirmed and treated as a modern convenience. Ports are typically behind a rubber cover that must be sealed for water resistance.
USB-C is the single physical port used for charging, wired playback, and power output to other devices. Several sources note a USB-C cable is not included in the box.