GoPro Hero4 Black Review: A Tiny 4K Triumph | Digital Trends
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GoPro Hero4 Black review: Smooth 4K video that's still the best in the category - CNET
GoPro HERO4 Silver vs HERO4 Black - GoPro Comparison Review
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GoPro Hero4 Black review: Smooth 4K video that's still the best in the category - CNET