Always be looking forward, and don’t dwell on what’s behind you. Good advice for life, not so great for a dash cam.
The Vantrue N2 features a secondary lens and sensor that faces backwards, so you’ll be covered if you ever get rear-ended. It won’t be as clear a view as you’d get from a second camera mounted directly against your rear windshield, but it could make all the difference in the case of an accident.