This is our mobile realtime DVR. Now you can make any Visionworks camera system into a video recorder. This small, easy to install and use, mobile DVR simply goes "in-line" with an SD card (up to 128 GB), you can loop at least 128 hours of video on the card. This is great for applications like vehicle security, monitoring foaling and calving, etc. This is better than a dash cam, because it records your blind spots, lowers your liability and catches criminals red handed!