... CCTV DVR Digital Video Recorder withDual USB/LAN/VGA/RS485/Video/Audio Features: - Operating system: Embedded Linux- Video standards: PAL/NTSC- Video compression: H.264 ... ,UDP,DHCP,DNS,IPFilter,PPPOE,DDNS,FTP,Email,UPNP,Alarm Server,ARSP- 2 USB interfaces, one for mouse,one for backup ...