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the groove slightly (in a direction as shown by the arrow in the picture), so that the
battery case can pop out.
Step 3: Take out of the battery case completely, and replace the batteries. Please note
that the positive terminal of the battery should face towards the no label side of the tag.
Step 4: Insert the batteries (with the case) back from the left bottom of the tag, and
then push the right end of the battery case to reassemble it.