Embedded Linux operating system, H. 264 compression format  Chinese, English, Korean, Japanese and other languages supported, NTSC and PAL video system  Full real-time audio& video playback  4 CH video inputs, 1 CH BNC master monitor output, 1 CH VGA display output (optional)  4CH audio inputs, 1 CH audio output  Display modes: PIP, full screen, 2 images, 3 images, 4 images  Image quality: Highest, high, normal, low  Detailed event log function support  Searching modes: Time & data searching, event recording searching, recording group searching  Support fast forward and fast back: X 2, X 4, X 6  Backup modes: Network backup, USB 2.0 backup, CD-ROM backup(optional)  Support RS-485 PTZ control(speed dome camera), and preset positions operation  Support network function: Remote monitor, remote playback, remote record, DDNS and so on  Support 1 SATA port HDD, more HDD support(optional)  4 CH alarm inputs, 1 CH alarm control output  Multiplex operation: Live & record & playback & network can be operated at the same time  Support USB mouse operation  Live display: 480fps(NTSC), 100fps(PAL)  CIF resolution record: 120fps(NTSC), 100fps(PAL)