Tribrid DVR Series DVRs - The 4 Channel Tribrid Series DVRs can record Analog, HD-CVI and IP all on DVR. This means you can use a combination of Analog Security Cameras (up to 960H Resolution), HD-CVI Security Cameras (up to 1080p Resolution), and IP Network Cameras (up to 1080p Resolution). This is great news for those who want to upgrade an old analog system and want to introduce High Definition Security Cameras to your lineup. HD-CVI uses the same coax as your analog cameras, so you can leave your power and cables in place. Over time, if you want to go completely with HD-CVI, no problem, just swap out your analog cameras with HD-CVI. You can even connect up to 2 IP Network Cameras. For both HD-CVI and analog you would use traditional 12v DC power.