... color & display zoneAudioAudio CompressionG711ABidirectional TalkSupportRecord &PlaybackRecording ModeManual>Alarm>Video Detection>ContinuousPlayback1~4 channels playback simultaneously,Pause,stop,rewind ... stickInterfaceVideo Input4 channel,BNC,1.0Vp-p,75Ω Video Output2 channel TV output BNC,1.0Vp-p, ... open/closed,Trigger recording,PTZ movement,tour,alarm,e-mail & FTP Relay Output1 channel,30VDC,1A,NO/ ...