Most GoPro cameras can film in 4K (3840 x 2160), but older models are limited to standard HD (1920 x 1080). Premium models can film in 4K at higher frame rates like 60 frames per second (fps), which results in smoother, more realistic video. If you need superior 4K video quality, you’ll need to look at the more expensive GoPro cameras, but if you need great but not amazing video, you can save a decent amount of money by getting a prior-generation model that records in HD.
I have been getting a lot of questions about which type of GoPro camera one should buy if interested. I first think it is great that you're looking into finally getting one, especially after watching the latest events on TV and all of the great camera angles they were able to capture of the professionals. I've had mine for 2 years and could not be any happier. Just last weekend I attached it to my dog on our hike and posted it to Facebook and got some likes from a few cute girls (because likes mean everything, right!?). I'll post the video later this week. I digress, and provide you with some tips when deciding to purchase your GoPro. We also highlighted the difference between the GoPro Hero 4 and 3+ cameras, so be sure to read that for some more help!
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