... mouse, front panel, remote control, network 7. USB interfaces 8.4 channel playback or single channel playback 9. Support LAN, WAN, ... ItemsSpecificationsVideo SignalPAL (625Line50f/s), NTSC(525Line60f/s)Video Input4 Channel, BNC , 1.0V p-p/75 ohmVideo Output2 ... or ClosedAlarm Output1 Channel, Trigger closed without VoltageOpen or ClosedAlarm ModeSensor Input, Motion Detection, Video Loss, Full Disk ...