4-Channel Video Standalone DVR,H.264 compression,Supports Real-time,Net work, ... ,50f/s), NTSC (525Line,60f/s)Video Input4 Channel, BNC,1.0V p-p/75 ohm Video Output2 Channel, BNC, 1.0V p-p ... /75 ohm,VGA x 1Audio Input4 Channel, RCAAudio Output2 Channel, RCA x 1 ...