This is a set of the following two items: * Osmo Action Multifunctional Battery Case × 1 * Osmo Action Extreme Battery (1,770mAh) × 1 The battery is compatible with Osmo Action 3, 4, and 5 Pro, but please note that the "Osmo Action Extreme Battery Plus (1950 mAh)" built into the 5 Pro cannot be charged in this case. Both the case and battery were purchased in December 2023 and have been used a few times. Please understand that this is a used item, and the case may have some scratches, etc.