http://***URL removed***/news/8382440790/xiaomi-yi-ii-action-camera-updates-original-with-4k-video-faster-sensor
WVGA/240fps
720p/240fps
960p/120fps
1080p/120fps
1440p/60fps
2.5K/30fps
4K/30fps
The only downside that I see is that it does not come with waterproof case like GoPro does (so the price is not that low). However, the original was hacked - maybe this one will be too.