digital video recorder dvr -H.264,4chs video,1ch audio -3G Mobile view -Factory Price ... H.264 4Chs 3G D1 CCTV Network DVR Recorder Features1)H.264 main profile compression algorithm ideal ... email,snapshot & FTPAudioAudio CompressionG711ABidrectional TalkSupportRecord &PlaybackRecording ModeManual>Alarm>Video Detection>ContinuousPlaybackMulti channels playback simultaneously,pause,stop,rewind,fast ...