C21vkwvlfvvam2r5.mp4 Link

The camera automatically saves and locks a video clip when it detects an impact or motion while the car is parked.

The ability to overwrite the oldest unprotected footage to ensure the camera never stops recording. C21VKWvLFvVAm2r5.mp4

The "useful feature" likely refers to one of the following common dashcam functionalities: The camera automatically saves and locks a video