Advanced Bionics Naida CI M90 Manuel D'utilisation page 53

Place the sound processor onto the ear and shape the retention wire
around to the front of the ear to ensure the M Retention Cuff fits snugly
and comfortably around the ear.
To remove the sound processor from the plastic casing, slide the sound
process up through the top of the plastic casing by pressing on the
bottom of the battery.
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