I have a Garmin DC56 fitted behind the rear view mirror and a Garmin DC 46 on the back window, they are powered off a piggy back fuse plugged into the front fog fuse No.3 and are switched on/off, for parking, via a small round switch fitted in the dome light at the front. they can be voice activated to record video or take a picture, there is also an app for use with your phone. nearly all dashcams come with a screen so that the angle of view can be set other wise it could be too high or too low to see the incident, hth