... real-time high compression, 2,support dual stream network transmission H.264 Stand alone DVR 16CH Model SF-D8016V Video Compression ... H.264 Video System NTSC / PAL Operation System Linux Video Input / ... rewind, manual PTZ Built-in RS-485 port, support PELCO-P & PELCO-D Backup USB Flash Disk, Removable HDD, Network Alarm ...