Omron HEM-711DLX Instruction Manual page 30

CARE AND MAINTENANCE
Remove the batteries if the unit will not be used for three months or
longer. Always replace all the batteries with new ones at the same time.
Use the unit consistent with the instruction provided in this manual.
Use only authorized parts and accessories.
CAUTION
Changes or modification not approved by Omron Healthcare will
void the user warranty. Do not disassemble or attempt to repair the
unit or components.
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