Im looking for a camera that will record while the car is off, ideally powered by a small power pack of sorts (I want to avoid a hard wiring kit). The VAVA Dash Cam will do this, but it only has a G-sensor activated recording, not motion activated. I need to be able to prove small impacts to my car, like a door hit, which would hopefully be caught via motion activated recordings as the culprit drove off. Im assuming my options are limited to mostly hard wiring kits and expensive $200+ cameras? Or is there something out there more reasonably priced that will do the job?