... ,preset,scan,auto pan,auto tour,pattern,auxiliary function supported9.Easy backup methods: USB devices,remote network ... ,HDD faulty alarm,Raid function12.Powerful network software:built-in web server,multi-DVR client &SMS Networking access ... Processor1 X HI3520A1 X HI3521Operating SystemEmbedded LINUXSystem ResourcesPentaplex function:live,recording,playback,backup & remote accessUser InterfaceGUI, ...