4 road independent audio and video(AV), display and compress, audio and video(AV)are synchronization, without electronic amplification 4road single channel, every channel can be set alone, MPEG4/H.264 video compression mode, higher compression ratio, and more saving disk space, CIF/Half D1/D1 ,three image format for defining number of frames are adjustable: 0.1 frame/SEC to 25 frame/SEC, adjust arbitraryly, several yards flow are from the definition, image resolution is optional. 4 road alarm input, 2 road alarm output, support shift detection alarm video and alarm for image lost, support 4road video, real-time monitor and 4road video are playback at the same time, specially designed for the video file system, improve the using life of hard disk exceed 10 times above, list of inquiry, quick inquiry, precise inquiry etc. Various retrieval way, built-in network function, the TCP/IP protocol, support WAN and dynamic ADSL networking , support network intercom of two-way voice , Specifications and parameters video signal: PAL (625 line, 50 games/SEC) NTSC system (525 line/frame, 60 games/SEC) video input: composite video: 1.0V p-p/75Ω, BNC connector x 4 video output: composite video: 1.0V p-p/75Ω, BNC connector x2 (VGA is optional) audio input: BNC connector x 4 audio output: RCA x 1 audio output, RCA x 1 talkback output alarm input: there is no voltage the contacts are closed , often open or closed, 4road input alarm output: there is no voltage the contacts are closed, often open, 2road output alarm mode: sensor input alarm, Video dynamic detection alarm, Video self-occlusion, alarm for losing, warn for full disk network mode: 10/100M adaptive Ethernet port support LAN, ADSL, DDN, WAN etc control method: support holder, lens control, RS485 interface x 1 backup method: USB backup, network backup, copy CD resolution: display resolution: 704 x 576 compression resolution is optional: CIF 352×288 Half-D1 D1 704×576 compression standard: MPEG4/H.264 hard disk: two IDE interface, support 4 large disk which exceed 300G above code stream Settings: 7 file code streaming is adjustable: 1 files 100MB/hour/road, 2 files 150MB/hour/road,3 files 200MB/hour/road,4files 250MB /hour/road,5files 300MB/hour/road,6files 350MB/hour /road,7 files 400MB/hour/road, custom: 1 ~ 100MB/hour/road security function: 128-bit data encryption + 2 level password management power source: 220V(±10%)/50HZ，180W power: 50W (excluding disk), environment temperature : working temperature：+5℃~+50℃； Humidity: < 90% storage temperature:-20℃~+70℃, Humidity: < 95% appearance dimensions:width×height × depth =432×96×375mm weight: about 7Kg