HIKVision 256ch NVR, 768M Inbound bandwidth, up to 12MP resolution recording, Max 256 IP cameras, HDMI output/input 6/1, 1 × USB 2.0; Rear Panel: 2 × USB 3.0, 3.0, RS-232, RS-485, RAID0,1,5,6,10, 24 SATA Interfaces, Alarm I/O: 16/8, 4U case, 3 Year Warranty - Shell only