Nikon D610 - Manual (Page 48)

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A
The AC Wall Adapter
Depending on the country or region of purchase, an AC wall
adapter may also be supplied with the charger. To use the adapter,
insert it into the charger AC inlet (q). Slide the AC wall adapter
latch in the direction shown (w) and rotate the adapter 90 ° to fix it
in the position shown (e). Reverse these steps to remove the
adapter.
AC wall adapter
latch
90 °