... 2 * USB2.0 interface, to achieve stable operation of USB Mouse, back-up, imprinting, upgrade, etc.6.Imitate ... stream, multi-channel playback, multi-channel network operation, USB backup, imprinting.interfaceOperating interface16-bit true color graphical menu ... networkBackup modeBack up by network, by flash stick, USB portable HDD, USB imprinting,InterfaceVideo input4ch BNCVideo output2ch BNC,1ch VGA,1 ...