GoPro makes some nifty little cameras, but their usefulness drops drastically when put up against a low-light situation. External lights are the solution, but if you’re using a spotlight or some other secondary battery-powered unit, the odds are it is both inconvenient and less than effective. The folks at Light & Motion are addressing that issue with their new Sidekick light, a rectangular LED light that is design specifically for mounting next to a GoPro camera to function as a complementary flash.

The Sidekick is exactly what its name suggests, and it brings itself along with the camera by mounting to the GoPro’s own mount. This is achieved using a longer bolt included with the Sidekick, which extends far enough through the mount to screw into the side of the light.
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https://www.slashgear.com/light-motions-sidekick-adds-light-to-your-gopro-16365067/