... dvr cctv dvrFeaturesD1*4CH, RS485, PTZ, Alarm, NetworkVGA, USB Backup, USB MousespecificationModelLS-9316HCompression FormatH.264Video SystemNTSC / PALGUI OSDYESVideo Input/OutputBNC 16CH ... , and support of drag the sliding bar to setBackup DeviceUSB flash disk / NetworkPre-alarm RecordingRecording for 10 seconds before alarmingNetwork ProtocolTCP ...