... .6m,12mm, 16mm AudioProcessorG.726 audio compression format,build-in two way audio processor,support two way Talkback.Two way ... Audio( Accept MIC) RCA interfaceAudio gain(AGC)NetworkNetwork interfaceRJ-45 10/100Mb, accept EthernetDelay time< 300 MSEL (0.30 ... ,9,16,25,36 or 64 multiple video display optional in one screen, support record, alarm, remote playback on records ...