... disk,upgrade etc...Alarm triggering screen tips,buzzer,PTZ preset,email,snapshot &FTP uploadSmart HDDs Management: ... ,Sensitivity:1-6(6 is highest)Trigger recording,PTZ movement,tour,alarm,email,snapshot & FTPAudioAudio CompressionG711ABidrectional TalkSupportRecord ... channelAlarm Input4channelRelay Output1channelNet InterfaceRJ-45 (10M/100M)PTZ Control1 RS485USB Interface2 x USB2.0Hard Disk1 SATA ...