4 Channels , & 16CH(with GV-A16 board) is optional Input TypeD-Type: DB15 x 2Video Input(s)4, 8, 12, 16 CamsAudio Input(s)4 Channels , & 16CH(with GV-A16 board) is optionalRecording Rate120 fps (NTSC), 100 fps (PAL).Display Rate120 fps (NTSC), 100 fps (PAL).Video ResolutionNTSC: 720x480, 720x480 de-interlace, 720 x 240, 640 x 480, 640 x 480 de-interlace, 640 x 240, 320 x 240 PAL: 720 x 576, 720 x ...