PCI type, can reach 32channels by install 2pcs on one computer D-Type: DB15 X 2 Video Input:4, 8, 12, 16 CH,Audio Input:4 CH D-Type: DB15 X 2Video Input:4, 8, 12, 16 CH,Audio Input:4 CHRecording Rate: 120 fps/100 fps(NTSC/PAL)Display Rate: 120 fps/100 fps(NTSC/PAL)Compression Format :MPEG4 / H.264OS: Windows 98/Me/2000/XP/Vista/Win7PCI type, can reach 32channels by install 2pcs on one computer