Use TVI technology has some advantages over IP cameras. The TVI technology can use Siamese camera wire making possible to run wiring more than 500 feet with out any loses on quality picture, besides this can uses an existing Siamese old wiring. With TVI is easy to upgrade any old security camera system. A few years ago TVI technology was available only in 2 megapixels, the only way to get more resolution it was through IP camera installation. The good news is that 5 megapixels became available since a few months ago. This new system is more affordable that 4, or 5 megapixels IP camera system. If you want to upgrade your old analog system, the new TVI technology is the best option.