digital video recorder dvr -H.264,4chs video,1ch audio -3G Mobile view -Factory Price ... /4VideoVideo StandardsPAL 625 line,50 f/s;NTSC 525 line,60 f/sVideo CompressionH.264 main profileVideo ... snapshot & FTPAudioAudio CompressionG711ABidrectional TalkSupportRecord &PlaybackRecording ModeManual>Alarm>Video Detection>ContinuousPlaybackMulti channels playback simultaneously,pause,stop,rewind,fast ...