... 1,4,9,16,25,36 channel monitoring in one screen, no channel limited ,Support centralized monitor ... 100,000 sWhite BalanceAutomaticBacklight CompensationAutomaticLensLensStandard : 3.6mmFilter switchBuilt-in IR Cut,With self-check function,Double optical fliter ... Φ5 LED IR distance: 10mAudioInput / OutputBuilt-in Microphone/Built-in Speaker Audio CompressionADPCMAudio GainAGC P/T Motor Built ...