... DVR -H.264 realtime network HD DVR -USB,PTZ,Audio,Network,VGA,HDMI -SATA HDD up to 2TB -Up to 720P resolution 4 channel ... HD DVR Features: 1. H.264 Real-time Recording, support USB, PTZ, network, two- ... Function;4. Playback, video, network transmission, mobile browsing, and backup etc. work simultaneously;5. Access to local multi-screen real-time preview ...