NEC Dterm Owner's Manual page 31

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Plug the AC adapter into the charging unit. Wrap the AC
adapter cord around the strain relief.
Figure 3-13 Wrapping the AC Adapter Cord around the
Strain Relief
Place the charging unit on the posts of the wall screws
and push down until it is firmly seated.
Figure 3-14 Placing the Charging Unit on the Wall
NEC America, Inc.
Installing the Dterm Cordless