FLIR Digimerge DNR8644 4K HD Security NVR, 64 Channel, 16 PoE Port, 4 HDD Slot, Max 24TB, Supports 720p/1080p/3MP/4MP/2K/5MP/8MP/4K Flir, Lorex, and Dahua IP Cameras, Dahua DMSS App,Rack Mount, Black,4TB Preinstalled(OPENBOX)