... ,tour,alarm,email,snapshot & FTPAudioAudio CompressionG711ABidrectional TalkSupportRecord & PlaybackRecording ModeManual>Alarm>Video Detection>ContinuousPlaybackMulti channels playback simultaneously,pause,stop,rewind,fast play ... search(accurate to second)Storage & BackupSpace OccupationAudio 28.8MB/H ;Video 25-450 MB/HRecord StorageLocal Hard disk and NetworkBackup ModeNetwork ...