DS-7204HI: 4-ch video input and 1-ch audio input. No VGA output. It can support CIF resolution real time compression.
DS-7204HI-V: 4-ch video input and 1-ch audio input. One VGA output. It can support CIF resolution real time compression
DS-7004HI-S: 4-ch video input and 4-ch video loop output, 4-ch audio input. Total 100FPS (PAL) at CIF resolution, 70 FPS (PAL) at 2CIF resolution,non-real time.
DS-7008HI-S: 8-ch video input and 8-ch video loop output, no audio input. Total 200FPS (PAL) at CIF resolution, 60 FPS (PAL) at 2CIF resolution,non-real time.
DS-7016HI-S: 16-ch video input and 16-ch video loop output, 40-ch audio input. Total 400FPS(PAL) at CIF resolution, 120 FPS (PAL) at 2CIF resolution,non-real time.
Note: The defaulted DVRs are without HDD and CD-R/W.