I'd really like to get a dash cam, but it's proving a bit difficult to find what I want.

I'd like to have one that is:
- low-profile or rear-view mirror replacement
- dual camera: front and rear (one in front window, one in back window or outside car)
- g-sensor w/ park mode (auto-record after collision or vibration sense)
- motion detection (auto-record when sensing motion outside; good for when parked)
- USB or other means of using battery separate from car when parked
- Optional: auto-backup to cloud when recording created

 

https://us.thinkware.com

 

These look less featured than others I’ve found. For instance, there’s only one camera per unit, and the parking mode must be hard-wired.