With the Nextbase 512GW Rear Camera you expand your Nextbase 512GW dashcam. You explain the traffic situation before and after you. When someone is driving on the back of your car, you use this to track down the driver. In the Picture in Picture mode, you merge the screens of the 2 cameras. This allows you to see both situations at a glance. You record images in Full HD quality with the rear camera. To record with both cameras, you need 1 micro SD card. Via a 6 meter long cable you connect the rear camera with the front camera.