Sharp Mobilon HC-4000 Operation Manual page 27

5. Insert a new CR2032 lithium battery with the plus (+) sign facing up.
6. Put the backup battery cover back in place and slide the battery replacement
switch to the NORMAL OPERATION position.
Note:
The unit operates only when the battery replacement switch is in the NORMAL
OPERATION position.
7. After battery replacement, turn on the unit and make sure no warning
message appears.
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