It's a Thinkware 800 it does have a voltage cut off if the battery were to get to a specified voltage. Iv'e read 2 posts that say they have used the fuse marked "Stop" and the one that says "Park" but I have not been successful with either one of those.
I am also running a Thinkware 2CH system in my vehicle and have it hardwired. I have a Cellink-B battery pack to power the cams while in parking mode.
- Connect yellow to a constant 12v fuse (Brake/stop lamp), red to an ignition switched/ACC fuse, and black to a ground
The "park" fuse only gets power when your parking lights are turned on.
Since you don't have a external battery pack for your dash cam(s) I would recommend you setting the cut-off voltage to either 12v or 12.2v.
Just so you know, there will come a time where your battery voltage will quickly drop to the cut-off voltage in under 30 minutes.
My brother has a Thinkware 2CH system in his Camry taking power straight from the battery. His cut-off voltage is set to 12v and after turning his vehicle off the camera shuts down due to low battery voltage after less than 1 hour. Car starts fine every time though.