... . 6TB HDD Dahua DH-NVR3216> 4/8/16 channel 1U standalone Network Video Recorder> Dual-core CPU presents the powerful preview, ... camera, Previous camera, Full screen, Repeat, Shuffle, Backup selection, Digital zoomBackup ModeFlash drive / USB HDD / USB CD&DVD-RW / ... FTP, Alarm Server, IP Search(Support Dahua IP camera, DVR, NVS etc)Max Remote Users20 Users simultaneouslyRemote OperationMonitor, PTZ ...