H.264 4ch full D1 real time DVR Supports VGA output up to 1280x1024 ... , Quality, Resolution, Bit RateHDD Overwrite WarningYesStorageInternal SATA Interface2Max.HDD Configuration4TBExport Interface2*USB2.0SearchSearch ModeDate/time, Channel, Sensor, Motion ... Rate on AlarmYesPre-event RecordingUp to 30 SecondsCommunicationConnectionEthernet RJ45, 10/100mbpsProtocolTCP/IP, RTMP, RTSP, SMTP, DHCP, DNNS, ...