Fly 12 and 6 as been mentioned.
This is a bit compressed, the raw footage is in really nice quality. Especially the front camera. The rear camera picks up sound better.
https://www.instagram.com/p/BUZ14x9g3IK/
The front is quite costly but its a nice setup and they are both lights as well for the "nighttime". The front is even a rather nice and bright light.
Both uses a loop system which means it will continue record over the old stuff when the memory is full unless you chose to save segments with a button or in case of a fall / incident (think its something like 3 seconds with the bike tilting more than 45 degrees or similar for it to auto save that and the previous and coming segment).
I can only say good things about in total even if there are a few software glitches in the app.
I get at least 7 hours of riding with the batteries which is good, never tried to record longer could perhaps do a bit more.