AS R Li 7, Руководство пользователя

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Observe the storage conditions in section
"Operating, transport and storage conditions".
Ear pieces
Cleaning
Cerumen (ear wax) may accumulate on the ear pieces.
This may affect sound quality. Clean the ear pieces daily.
For all types of ear pieces:
X
Clean the
ear piece right
after removal
with a soft and
dry tissue.
This prevents
that cerumen
becomes dry
and hard.
Exchanging
Exchange standard ear pieces approximately every
three months. Replace them sooner if you notice
cracks or other changes. The procedure for exchanging
standard ear pieces depends on the type of ear piece.
In section "Components and names", your Hearing Care
Professional has marked your type of ear piece.