... port support DDNSSupport USB/mouse operationUSB file backup, With VGAvideo input/output: 4ch/2CH Alarm: 4ch in/1ch outSupport mobile phone viewSupport ... ,CCIR625line,50sceneNTSC,30f/s,CCIR525line,60sceneAudioAudio input4ch audio input,impedance600Ω,RCAAudio output1ch audio output,impedance600Ω,RCABasic electricity outputLinearity electricityRecord styleAudio video recorded ...