Impecca DVPDS720-2 Mode D'emploi page 9

Connecting the Secondary Display:
On the main unit, plug the Video/DC Secondary Monitor
Cable into the AV OUT and DC OUT ports.
On the secondary display, plug the Video/DC Secondary
Monitor Cable into the AV IN and DC IN ports. Remember to
turn on the Power On/Off switch on the secondary display
unit if the screen remains black.
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