... channel; 1D1(75fps) + 3CIF(25fps)Video output1 channel,1.0V,p-p,75Ω,BNCVideo formatSupport PAL/NTSCVideo compressionH.264 high profileVideo bitrate1.98Mdps ... video qualityAudioAudio input4 channelAudio output1 channel,500Ω,RCAAudio level1~2V,p-pAlarmAlarm input6 alarm input, No alarm below 4V, high level ...