... disk,remote control,USB backup. The feature of DVR-0402: MODEL NUMBER DVR-0401Video record formatM-JPEGSystem resources4 channel real time ... control .Vedio systemPAL,NTSCAudio compressionADPCMRecord modeManual,Time fixed,Alarm,Motion detectionRecord search modeDate/Time search,Event search,channel search,LOG ... )OSD LanguageEnglish,chinese, Russian Realtime 4 Chnnel CCTV Security Digital Video Recorder