... dvr digital video recorder -H.264 realtime HD 720P DVR -USB,PTZ,Audio,Network,VGA -720p realtime record -2 HDD, 4TB 4 channel HD DVR ... Features: 1. H.264 Real-time Recording, support USB, PTZ, network, two-way ... simultaneously;5. Access to local multi-screen real-time preview, settings, backup and playback video through IE; 6. Recording Resolution up to ...