Input Type no Video Input(s) 1、4 Cams Audio Input(s) 1 channel Recording Rate 30fps (NTSC), 25fps (PAL). Display Rate 30fps (NTSC), 25fps (PAL). Video Resolution 352?88，768?88，768?76 Compression Format MPEG-4 File Size 2 ~ 4KB(320 x 240,Medium level) Network LAN, Cable modem, ISDN, PTSN PTZ RS232 (PAN / TILT / Zoom / IRIS) Other one system support 1~4cards,16 channels video input max. arbitrary distribute the image resolution of each channel