Economic H.264 4/8/16channel Network CCTV DVR Support 3G and Real time 1/2TB HDD,VGA,USB mouse,remote controller ... real time remotely monitoring,such as Iphone,Nokia Blackberry,Google and windows mobile.SystemMain ProcessorHigh performance embedded microprocessorOperating SystemEmbedded LINUX System ... RS485 SD InterfaceSupport(optional) Hard Disk1 SATA ports(Max 2048G) DVR Support 3G and Real time