Vivitar VIV-PG-5DMII - Manual (Page 16)

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Using the Battery Grip
Turn the vertical grip ON/OFF switch to
the ON position (see figure 11) in order to
make the buttons and dials on your power
grip function in the same way as those on
your camera.
When shooting in the horizontal grip position, turn the vertical grip ON/OFF switch to the
OFF position so that you do not accidentally use the buttons or dials on the power grip.
CAUTION
Remove the power supply from your power grip when your camera will not be used for an
extended period of time.
Never attempt to disassemble or repair this device. Any malfunction or accident resulting
from such action is not covered by your warranty.