Side by side comparison between the YI 4K action camera and the GoPro Hero4 Silver. This video is a visual and audio comparison of the two action cameras.
Buy YI 4K: http://amzn.to/2apX6AL
Buy GoPro Hero4 Silver: http://amzn.to/2aTMBZG
Buy YI 4K: http://amzn.to/2apX6AL
Buy GoPro Hero4 Silver: http://amzn.to/2aTMBZG