Dahua 720P Realtime 16 Channel HDCVI DVR - HCVR5116H Mini 1U 16CH HD-CVI DVR Up to 16 cameras with 1080p realtime preview. H.264 dual-stream video compression 16 channel synchronous realtime playback, GRID interface, smart search. 3D intelligent positioning with Dahua PTZ dome camera HVR501H16S2: New Tribrid Version All channel 720P realtime or 1080P non-realtime recording. HDMI/VGA simultaneous video output Supports 1 SATA HDD up to 4TB, 2 USB2.0. Multiple network monitoring: Web viewer, CMS(DSS/Smart PSS), Smart Phone(DMSS) New Tribrid HVR501H16S2 Compatible with Analog, HDCVI. No HDD included.