Toshiba OIS PLUS Series User Manual page 70

On the expansion case two slots are provided which rest on the base model back case as shown in the
figure below:
Here, the expansions rest with the base model. Then push down the locking connectors towards each-other.
This will lock the expansion finally with the base model.
Please note that along with these two joining (Locking connector as well slots), male connector from the
expansion model will be insert into the female counter part on the base model termed as "EXPANSION PORT".
Final Unit:
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