... HDD, Max 2048G 4-CH Alarm input 2012 Hot sale, China Manufacture digital video recording system ModelBSD-7104VBSD-7104AVSystemMain ProcessorHigh performance ... -6(6 is highest)Trigger recording,PTZ movement,tour,alarm,email,snapshot & FTPAudioAudio CompressionG711ABidrectional TalkSupportRecord &Recording ModeManual/Alarm/Video Detection/ContinuousPlaybackPlaybackMulti ...