Car dash camera or car DVR, usually consider as the vehicle black box, is mainly used to record what happened during the driving. This is a new popular in-car device, and has received a great popularity recently. Home-use DV is a common digital product, and people mainly use it to record some great moments in daily life. These two items are very similar, the main function of which is to record videos. But in some respects, they also have some difference.