The majority of users would likely say there aren't many ways to improve the GoPro action cam, but the 'Sidekick' camera lighting device is designed to make the most of the device.
Fitting onto the side of the action cam, the 'Sidekick' works by offering crisp illumination to record videos and capture photos in low-light situations. Coming in either black or silver color options, the 'Sidekick' flash features a rechargeable battery to ensure the device is always ready for usage. The multifunctional design of the 'Sidekick' allows it to be used with the GoPro in a variety of different orientations to maximize functionality.
When fully charged, the 'Sidekick' camera lighting device will provide roughly an hour of operation on the highest level or up to four hours when set to low.
The 'Sidekick' GoPro Camera Lighting Device Makes the Camera Better
Michael Hemsworth — March 16, 2016 — Tech
References: lightandmotion & ippinka