... & display zoneAudioAudio CompressionG711ABidirectional TalkSupportRecord &PlaybackRecording ModeManual>Alarm>Video Detection>ContinuousPlayback1~4 channels playback simultaneously,Pause,stop,rewind ... Input4 channel,BNC,1.0Vp-p,75Ω Video Output2 channel TV output BNC,1.0Vp-p ... output Audio Input4 channel ,RCA, 200-2800mV,30KΩ Audio Output1 channel ,RCA, 200-3000mV,5KΩ Alarm Input4 channel ...