Audiovox LCM640TV - Manual (Page 6)

Notes
All systems have a built in Audio/Video input. When the unit is on
source #3 and another external source is plugged into the RCA
Audio/Video input jacks, source #3 is interrupted and the external
source (considered source #4) will be the current source.
For audio output, there are a few scenarios that may apply to your
system.
A) All systems have two headphone jacks built into the rear of
the Video pod. These are behind the TV when flipped down.
B) Remote headphone jacks may be added and located
throughout the vehicle.
C) Additional speakers and amplifiers may be added throughout
the vehicle.
Lights on the pod serve as dome lights. There is no switch on the
pod that turns these off and on. The lights are turned on when a door
is opened or the interior lights are turned on.
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