If the power socket stays on all the time, then I would think that when the dash cam is connected to it, it would continuously record (loop) for the time frame that you set it at.... for instance 3 minute clips. With my car, a Toyota RAV4, the dash cam is only powered on IF I have my engine on or I have it hooked up to a power bank. Meaning, I can have my dash cam plugged into the charger but if my engine isn't on, the dash cam will switch to the "Parking Monitor," and utilize the internal battery....in which, it takes 30 second clips and saves/locks onto your microSD card every time it comes on.
On a side note, regarding the Parking Monitor...... I've found that even when I have it turned off. It still somehow comes on. Which is annoying. Hope this helps. If nothing else, call Roav. They have excellent customer service.