GoPro’s little action cameras, like most other action cameras, are small and lightweight, which is convenient in many filming scenarios, but comes with a downside: keeping the camera steady while recording is difficult, and footage is often shaky. There are many stabilizers on the market that try to mitigate that, but some of them are too inconvenient for most action camera-users’ needs. StabCam differs from them, however, being designed specifically for the GoPro and any of the camera’s own mounts.

StabCam is designed to work with the GoPro regardless of which version you have; it tracks a subject automatically, and gets its power from a swappable battery that’ll give two hours of 3-axis stabilization.
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https://www.slashgear.com/stabcam-is-a-gopro-stabilizer-for-the-cameras-own-mounts-17379729/