GoPro Hero4 Black review: Smooth 4K video that's still the best in the category - CNET
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Amazon.com : GoPro Hero4 Black : Electronics
Amazon.com: Hero 4 Microphone Compatible with GoPro Hero 4 Silver Black White Edition, Hero 3, Canon, Nikon Camcorder DSLR Camera- External Lavalier Lapel Mic : Electronics
GoPro Hero4 Black Review: A Tiny 4K Triumph | Digital Trends
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Amazon.com : GoPro Hero4 Black : Electronics
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GoPro announces Hero 4 models with 4K/30fps recording and touchscreen display