... playback simultaneously DVR,HVR,NVR,3 in1 XM Cloud Technology DVR 1ch HD SDI CCTV DVR 8ch D1, 1080P Support:Arabic,Czech ... /ch ; Audio: 691.2M/day/channelHDD ManagementHard disk hibernation technology,HDD faulty alarm & Raid(Redundancy)Backup ModeNetwork download/Flash stickInterfaceVideo ... etc.Remote Control: Multi-device client software CMS XM Cloud Technology DVR 1ch HD SDI CCTV DVR 8ch D1, 1080P