The Feiyu G5 is a small gimbal that is designed just for GoPros.
It is splash proof (although not waterproof!) - useful if you are using your GoPro in wet conditions.
Its battery lasts up to 8 hours, so you could use this all day long with your GoPro. You will definitely have to change GoPro batteries before changing gimbal batteries!
Its 4 way joystick let you control its low noise and high precision brushless motors to point the camera where you want, and they keep it stabilised.
The Feiyu G5 is compatible with GoPro HERO6, HERO5 Black, HERO4 Black and Silver, and other action cameras with approximately the same size and form factor as those GoPro models