video input: 8 channel video inputs with bnc. audio input: 2 channel audio input with microphone. surveillance channel: 2 cards can be inserted in the same pc at most, to form 16 surveillance screen real time display modes. video resolution: 640 x 480, 352 x 288, 320 x 240 ( both view and playback ). compression mode: latest mpeg-4 / h.264. compression ratio: 60-150m/c/h (60-150m of hard disc each channel per hour). video total frame rate: 240fps in ntsc, 200 fps in pal for display and recording. operating system: windows2000 professional / server / xp. network protocol: tcp/ udp. network port: 9000/9001/9002. more surveillance products info pls visit our website at www.szkws.com