QNAP VS-2004 PRO VioStor NVR. Total storage capacity: 0 GB, Hard drive capacity: 0 GB, Maximum capacity: 4 TB. Internal memory: 1 GB, Flash memory: 512 MB. Supported network protocols: HTTP, TCP/IP, SMTP, DHCP, Static IP, DNS, DDNS, FTP, NTP, UPnP. Management protocols: FTP, SMB/CIFS. Noise level: 34.2 dB