... operation of preview, recording, playback, network transmission, backup and mobile control.Chinese, English, Thai, Russian, French, Spanish ... ,E-mailMotion DetectionConfigurable detection areas 352(22*16) and Sensitivity 5 levelsVideo LossSupportAlarm Input4chOutput1chPlaybackSynchronous Playback4-chSearch ModeDate, Time ... without hard disk)2.6KG 4CH dvr cctv surveillance /cctv dvr recorder(D7104A-U)