Mine is a Nextbase 312. It only has a forward facing camera but has wifi facilities. The quality of the 3 minute clips are amazing, oh complete with clear audio so be careful what you say in the car, it can be embarrassing as I found out to my cost! I got Halfords to hard wire it into the fuse box for an extra £30. This means it will come on as soon as you start the car and switch off when the engine cuts. Also your insurance premium should be reduced as well.
Now to search for a reasonable tracker.