HD-SDI High Definition security cameras DVRs, The first technology to introduce full HD 1080p Real-time security cameras over coaxial cable, high-definition serial digital interface (HD-SDI) with up to 2MP crystal clear 1080p at up to 30fps real time display and record capabilities, HD-TVI DVRs allow you to utilize your existing cabling to upgrade to high definition security cameras, which will save you a lots on labor cost and cabling. We have a collection of HD-SDI DVRs from 4Ch up to 16Ch, also available in hybrid in our Magic series HD-SDI DVRs allowing traditional cameras and HD-SDI cameras to work side by side, all with support of mobile remote viewing apps for your phone.