Holux Portable Automobile Navigation System - Manual (Page 25)

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Using the SD Memory Card
This unit is equipped with a SD memory card slot; you can purchase SD
(Secure Digital) Cards to expand the memory capacity.
Insert the memory card as below: turn to the right side of the unit and
with the metal contacts of the memory card facing back, insert the card
into the slot.
Removing the Memory Card
1. Gently press the top of the memory card, and the card will eject
automatically.
2. Then remove the memory card.