GoPro Hero4 Silver Review: King of the Action Cam Mountain | Digital Trends
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GoPro Hero4 Black review: Smooth 4K video that's still the best in the category - CNET
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GoPro HERO 4 Black Edition 4K Action Camera Camcorder for sale online | eBay
GoPro Goes 4K with HERO4 Black, Adds Touchscreen to HERO4 Silver, and Debuts $130 Entry-Level HERO | PetaPixel
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