Maybe you've seen cameras that have exactly the same shape, color and specifications, but different brands. You need to know that usually these cameras are generic cameras produced by the same factory, but given brand labels by the distributors.
2. Read reviews
When you want to buy a camera, you don't feel complete if you don't read the reviews first. So, if you like reading reviews like this, you can definitely get more information before buying so you don't regret it later.
3. Make sure there is a guarantee
Action cam is one of the products that many people complain about because of warranty issues. Action cams with an official guarantee usually have an official company website complete with complete distribution data and warranty contact info.
4. Real/fake resolution
Not a few have been cheated, when they bought it they said the video resolution was up to 4K, but when they tried it the video was very far from the quality expectations. You need to know that some action cams are written in high resolution such as 4K. It's not wrong, technically the camera produces video with 4K resolution, but actually the video is the result of interpolation (doubling the number of pixels) of the actual resolution.
Interpolation is a technique for increasing resolution by imitating pixels. So this software is embedded in the camera to fill in empty pixels to make the resolution greater. If you resize a 600x600 photo to 1200x1200, the result will definitely be blurry and broken.