Dell Inspiron Port Replicator User's Manual page 7

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The audio line-out connector is on the side of the APR (see Figure 1-2).

      
The controls and indicators on the APR are shown in Figure 1-3.
unlocked
position
eject
position
drive
access
indicator
power
indicator
power button
undock request button
locked
position
eject/locking
lever
Dell Inspiron Advanced Port Replicator User's Guide
audio line-out connector
padlock
slot
security
lock slot
docking
indicator
1-3