Advanced Bionics Naida CI Listening Check CI-5823 Mode D'emploi page 12

Turn one piece 90 degrees, aligning the AB logo piece to slide into the other piece.
Note: The Listening Check requires a charged power source to function correctly.
If the power source being used to conduct the Listening Check has been depleted to
an inadequate charge level, the user will not be able to complete the task.
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Push together until it snaps into place.