DVR (DigitalVideoRecorder) is a set of computer storage system for image processing, with a long video / audio recording, recording, remote monitoring and control functions, DVR collection of video recorders, splitter, PTZ camera control, alarm control , Network transmission and other five functions in one, with a device that can replace a lot of analog monitoring system equipment, features, but also the price advantage. It uses digital recording technology, which is far superior to analog monitoring equipment in terms of image processing, image storage, retrieval, backup, network transmission and remote control. DVR represents the development direction of video surveillance system and is currently on the market Video surveillance system of choice products.