... D1, On sale 2 channel D1 Digital Video Server with Storage for surveillance system> Video Resolution: D1/Half-D1/CIF/QCIF> HDD ... Hue, Contrast, Saturation, Image quality.Streaming FormatOptional Video Streaming or Audio &Video composite StreamingVideo Frame Rate PAL: 1-25 frames/second ... or NTSC; BNC, level: 1.0Vp-p, impedance: 75Ω,Audio CompressionG.726, G711, ADPCMAudio Input1/2/4 channel, RCA port ...