... , Previous camera, Full screen, Repeat, Shuffle, Backup selection, Digital zoomBackup ModeUSB Device / eSATA Device / Internal SATA burner/ NetworkNetworkEthernetRJ ... InterfaceUSB Interface4 ports (2 Rear), USB2.0RS2321 port, For PC communication & KeyboardRS4851 port, For PTZ controlGeneralPower SupplyAC100~240V, ... 460mm×89mmWeight6.5KG(without HDD)Application System 16CH Digital Video Recorder DVR