Hitachi AX-M140 Instruction Manual page 29

Insert batteries in the remote control
When inserting batteries make sure they are the correct way around as shown below.
Remove battery cover
Carefully slide then lift the battery cover
from the back of your remote control.
Insert batteries
Insert two AAA size batteries into the
battery compartment.
Make sure they are inserted as shown.
Replace battery cover
Slide the battery cover back into place.
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