Why do I have .SEC files? (YI 4K Action Camera) .SEC files are much lower in bit-rate which allows you to quickly preview videos on the app. Related articles Why do I have .SEC files? (YI 4K+ Action Camera) How do I download videos and photos from the app?(YI 4K Action Camera) Which FOV viewing angle mode can be available under each video resolution in the camera? Does the YI 4K Action Camera have a dash camera mode? How do I use the dash camera mode? What is the bitrate for each resolution? How much space does each minute of video take up accordingly?