Omron HEM-9210T Instruction Manual page 31

Using the Optional AC Adapter
Note: Make sure to use an easily accessible power socket in which to connect
and disconnect the AC adapter.
1. Insert the AC adapter plug into the
AC adapter jack on the rear side of
the monitor.
2. Plug the AC adapter into an
electrical outlet.
To disconnect the AC adapter, unplug the
AC adapter from the electrical outlet first, and then remove the AC adapter
plug from the monitor.
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