The HD-CVI DVR systems are compatible with HD/CVI cameras. These systems are able to transmit video, audio and pan/tilt/zoom over one cable. It can transmit up to 1500 feet which is much further than Network IP systems. The HD-CVI DVR systems record high definition video, up to a 1080p resolution. These systems provide high definition video, longer transmission ranges and fewer cables for a much lower cost than many Network IP and HD-SDI systems. The HD-CVI DVR systems are available in 4, 8, 16 and 32 camera options.