... , DHCP, DNNS, PPPoENetwork Functionspan>Support to live view with IE (Internet Explorer) & with Mobile phoneUSB2.0USB mouse, USB disk (backup, upgrade ... frameBackupBaBackup AVI file via USB flash disk, USB disk, USB CD/DVD-RW & NetworkPTZ ControlBuilt-in RS485, support PELCO-P & PELCO- ... -10˚ - 50˚Dimension90mm (Dia) x 175mm (L) 4ch network standalone dvr & 4pcs 520tvl ir camera cctv system