... digital video recorder -H.264 realtime HD 720P DVR -USB,PTZ,Audio,Network,VGA -720p realtime record -2 HDD, 4TB 4 channel ... ADPCMAudio InputRCA*4Audio OutputRCA , 1 channel Two-way AudioSupportStorage&backupHDD Port2 SATA ports ... Support Preset, Patrol, PatternAlarmVideoMotion detection, Video loss detection, Temper detectionIO input/output4CH Input ... D) Weight4.5kg HD 720P DVR Digital Video Recorder