Audiovox VBP4000 Owner's Manual page 6

4.Powering the detached monitor in the vehicle (Refer to
Figure 4)
Take the cigarette lighter adapter from the lower compartment, plug
one end into the DC 12V jack on the right side of the monitor, then
plug the other end into the cigarette lighter socket.
Note:
1) When the monitor is combined with the main unit, the inside
signals including DC 12V power will be supplied from the main
unit to the monitor, so there is no need for another power source
to be connected to the DC 12V jack on the right side of the
monitor.
2) Refer to Figure 5 and 6. When the monitor is detached from
the main unit, you can connect the PORT on the right side of
the monitor to either MONITOR 1 port or MONITOR 2 port on the
left side of the main unit with the supplied DIN cable. When the
monitor is connected to the main unit with the DIN cable, DC
12V power, Audio/Video and IR signals will all be supplied through
the DIN cable to the connected monitor. So there is no need for
another power source to be connected to the DC 12V jack on
the right side of the detached monitor.
3) When detaching the monitor from the main unit, make sure
the system is unplugged from the power source to avoid
the risk of electric shock.
Figure 4
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