High Definition Composite Video Interface (HDCVI) is brand new to the CCTV and security camera industry. With it, comes a few new, and very cool capabilities. While you may not see any great advancements in the high definition (HD) resolution, these new features that come at a pretty incredible price do more than impress.HDCVI is a little different from other analog and HD type cameras. Unlike other variations, you'll find that in most cases, you'll need to be using solid copper RG59 Siamese cable. Why? Well, it's because HDCVI cameras are capable of transmitting video up to 1600 feet. Let that sink in for a moment. Gone are the days of being limited to runs up to 300 feet with standard analog and other HD cameras.