GoPro Hero4 Black review: Smooth 4K video that's still the best in the category - CNET
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GoPro Introduces HERO4: The Most Powerful GoPro Lineup, Ever | GoPro
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GoPro Goes 4K with HERO4 Black, Adds Touchscreen to HERO4 Silver, and Debuts $130 Entry-Level HERO | PetaPixel
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GoPro HERO4 Silver vs. HERO4 Black Comparison and Review - YouTube
GoPro Hero 4: Everything You Need to Know - Outside Online
