1. The Expansion Adapter can expand to fit a cold shoe and an action camera port. With this adapter, Osmo Pocket 3 can be compatible with most Osmo Action accessories (such as the Osmo Backpack Strap Mount). 2. Dimensions: 49.4 × 58.5 × 60 mm 3. Weight: 40.3 g 4. Compatibility: Osmo Pocket 3