The DJI Multifunctional Battery Case for Osmo Action 3 lets you store and charge up to three batteries for your Osmo Action 3 camera. The case stores three Osmo 3 batteries and it can also fast charge them simultaneously. The case can be powered by an external power source via its USB Type-C port and it can also act as a power bank to power other devices via that same port. The case even stores two microSD cards to keep them safe and protected.