... , VGA, USB2.0 and 2 H 8 channel dahua digital usb video recorder with POE KD-1508N-P: 8 channel@D1, 8 ... Bidirectional Talk1 channel Input, BNC(200-2800mV, 30Komh)1 channel Output, BNC(200-2800mV, 5Komh)DisplayDisplay Split1/41/4/8/91 ... , Next camera, Previous camera, Full screen, Repeat, Shuffle, Backup selection, Digital zoomBackup ModeFlash drive/ USB HDD/ USB CD&DVD-RW/ Network ...