... , ONVIF HDMI, 8pcs HDD 4.2U 16CH NVR High Quality Dahua Onvif Nvr 4/8/16 Channel 2U Professional ... ~120 min (default: 60 min)Video Detection & AlarmTrigger EventsRecording, PTZ movement, Tour, Alarm, Email, FTP, Buzzer & Screen tipsMotion ... DVR, NVS etc)Max Remote Users20 Users simultaneouslyRemote OperationMonitor, PTZ control, Playback, System setting, File download, Log informationHard DiskHard ...