If you're going to be switching it between vehicles, you might want to see if you can get an extra power cord from the company that makes them... http://www.getdashcam.com/support.php
That way you can try and hide the cord away as I did without having to worry about removing it every time you wanna swap the camera to your other ride.
(or just maybe one locally that will be compatible with the Dash Cam unit.