... ,50f/s), NTSC (525Line,60f/s)Video Input4 Channel, BNC,1.0V p-p/75 ohm Video Output2 ... 1Audio Input4 Channel, RCAAudio Output2 Channel, RCA x 1, Bidirectional talk x 1Alarm Input4 Channel, Trigger closed without Voltage,Open or ClosedAlarm ... Output2 Channel, Trigger closed without Voltage,Open or ClosedAlarm ModeSensor Input ...