Video input: 4 channels Video output: 4 channels Audio input: 1 channels Audio output: 1 channels Recording rate: 30 fps (ntsc), 25 fps (pal) Display rate: 30 fps (ntsc), 25 fps (pal) Video resolution: 640x480, 384x288, 320x240 192x144, 160x120 Compression format: mpeg4 Compression type: software compression Chipset: connexant878a Operation system: win98/2000/xp Software language: english & chinese Network type: support remote control Remote type: Backup type: Tv out: no Single system support: 4 pcs Card dimensions: mm Card weight: 0 kg Description: Mpeg-4 compressing format, it allows 4-line video input and 1-line audio output. Vacuum engrossed by kinescope is about 60m-100m/line/hour When using signal line to collect, it can offer synchronized perfect video frequency collection function. You can select different speed when replaying, speed or backward. Signal alarm could be transmitted through lan or long distant area network. It could realize skimming and playing-back over image at long distance, could transfer through telephone line , could skim over through ie. It could support installing 4 pieces of card by signal system, and could realize 16 lines video frequency gathering, the general resource of kinescope is about 100 frames.