With DJI Osmo Pocket, you can record your videos at a highest resolution of 3840 x 2160 at 60p, 50p,48p, 30p, 25p, 24p fps with bit rates up to 100 mbps and save in and MP4 (MPEG-4 AVC/H.264) formats. DJI Osmo Pocket's 4K is the common standard resolution in consumer video world.
Osmo Pocket features a high speed mode where it captures videos at 240fps which helps to create slow motion videos. If you shoot a video at a frame rate of 240fps and play it back at 24fps, the video will be 10x slower and longer than normal.
Osmo Pocket has a built-in microphone and a Mono speaker. On the other hand, DJI Osmo Pocket doesn't have any connections for external microphones and headphones. If you need a Action Camera camera with external microphone connectivity, consider or in a similar price range.