HD TVI Digital Video Recorders DVRs 4 Channel, 8 Channel and 16 Channel and up to 32 Channel. HD TVI Technology makes it simple to upgrade you current CCTV system. HD-TVI DVRs are made with Tribrid Technology. They Support older analog cameras and New HD TVI high definition cameras with 720p 1.3MP to 4K 8MP resolution. You can mix and match old and new technology on one DVR unit. In Addition HD TVI DVR may support IP cameras as well. With HD TVI DVR you can replce your existing DVR unit with no need to replace all cameras. With HD TVI DVR you can control compatible cameras using built-in camera OSD setting without a need to run extra wiring. Please, see our demo of HD-TVI System: