Model DS-4004HCI Compression Standard Video H.264 ,Support CBR,VBR Frame Rate 25F/s(PAL), 30F/s(NTSC) Preview Resolution 4CIF: 640*480 (NTSC), 704*576 (PAL) Video Resolution 4CIF: 640*480 (NTSC), 704*576 (PAL) ; 2CIF: 640*240 (NTSC), 528*384 (PAL) ; CIF: 320*240 (NTSC) , 352*288 (PAL) ; QCIF: 160*120 (NTSC),176*144 (PAL) . Video Input 4 Channels ; BNC(Vp-p = 1.0V, 75) Video Output Video stream or Audio &Video stream; 32kbps-1000kbps(CIF) or 70kbps-4000kbps(4CIF) Audio Compression OggVorbis, Sample ratio is 16KHz, Output ratio is 16kbps Audio Input 4 Channels BNC(Vp-p=2.0V,SNR>83DB,Linear Electrical Level1000) Dimension 155 mm * 95 mm Power Consumption Less than 3.5w Computer Configuration CPU: Inter Series Main-board: based on Intel 845/ 865/915 chipset RAM: 256MB or above Display Adapter: Nvidia Geforce 400/420/440 series,FX 5200 /5600 Geforce 6600; ATI Radeon7000/7500/8500/9000/9200/9550/9600 series; ATIX300/X550/X700/X1300/X1600; Intel845G/865G/915G Integrated Graphics Controller.