... Support 1,4,9,16,25,36 channel monitoring in one screen, no channel limited ,Support centralized monitor, remote record, ... Auto Backlight CompensationLensStandard : 3.6 mm Filter SwitchBuilt-in IR Cut,With self-check function,Double optical fliter ... vision10 Φ5 LED IR distance: 10mAudioInput / OutputBuilt-in Microphone/Built-in Speaker Audio CompressionADPCMAudio GainAGC Pan/TiltRotation AnglePan: 355° ...