Software Compression DVR:GV-250(S) Video Input(s):1,2,4, 6, 8, 10, 12, 14, 16 Cams Audio Input(s):1 channel Recording Rate:20 fps (NTSC), 16fps (PAL). Display Rate:20 fps (NTSC), 16fps (PAL). Video Resolution:320x240, 640x240, 640x480, 640x480sw Compression Format:Wavelet, MPEG-4, GeoMPEG-4 OS:Win2000/Win XP