NVR (Network Video Recorder) is a part of the IP video surveillance system. This device is designed to record and archive video, as well as for subsequent transmission to the monitor. Technically the recorder is a network drive with sections for audio and video recording. The number of audio and video streams varies from 4 and above. NVR is capable of recording regardless of the distance from the cameras. This device allows one to watch video in real time, and also to work with the archive, and all this in one interface. The connection between IP cameras and video recorder performs via Ethernet or the Internet. The Network Video Recorder is mostly equipped with motion detector. Unimportant videos can be automatically deleted after a certain period of time. This time period is determined by the operator of surveillance. In addition, there are technologies allowing recording the frames of high importance in a separate section of the disk, where they are kept longer than ordinary data. The appropriate operating systems for NVR are Windows and Linux. The number of supported channels of the device varies from 5 to 32.