The DJI Multifunctional Battery Case for Osmo Action 3 stores and charges three Osmo Action 3 batteries. It can be powered via USB-C cable (not included) by an external power source for fast charging of three batteries simultaneously, and using the same port it can also serve as a power bank to power other devices. The case also features slots for storing two microSD cards.
The DJI Multifunctional Battery Case for Osmo Action 3 rental is just for the battery charging case, no batteries are included. If you need some, grab them here. This rental also does not include a USB C cable or AC Adapter. If you need one for on the go charging, check this out.